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Frequently Asked Questions (F.A.Q.) :

Construction and Facade

Q1. I have a natural stone substrate which needs to be sealed. What do I use?

A. Many products contain oil or plasticizers that will penetrate into porous substrates, like natural stone. Applying these products will result in a dark edge around the seal, contamination. This contamination cannot be removed or reversed. We recommend to apply the Bostik S955 SEAL’N’FLEX NON-STAINING, Bostik S960 SILICONE NON-STAINING or the Bostik H750 SEAL’N’BOND PREMIUM, to avoid contamination and to offer you the ability to seal the natural stone. For more information please read the FactSheet FS012 Suitability and pre-treatment of surfaces.

 

Q2. Do I need to use a primer before sealing?

A. It is recommended in almost all situations, especially when you are dealing with porous substrates. For more information please read the FactSheet FS012 Suitability and pre-treatment of surfaces.

 

Q3. What is the correct dimension of the joint sealant?

A. The minimum dimension of a joint sealants is 5 mm in width and 5 mm in depth. The maximum dimension of a joint sealant is 20 mm in width and 16 mm in depth. An durable joint sealant is depending on the movement of the adjacent building elements and the use of a correct backer rod. For more information please read the FactSheet FS008 Joint Dimensions.

Soft Flooring

1.   Can I use a hardwood flooring adhesive for vinyl?

No, for further questions, please contact your local Technical Representative for specific product recommendation.

2.   Does this provide a moisture vapor barrier?

No, Bostik has specific products developed for moisture and vapor barriers. For further questions, please contact your local Technical Representative for specific product recommendation.

3.   Can I use this over an existing vinyl floor?

Yes, based on the industry association, you can only bond to a maximum of 2 layers together as long as it is kept in good conditions, well bonded, clean and free of any divots and other contaminants. For further questions, please contact your local Technical Representative for specific product recommendation.

4.   Is this a wet lay installation, or is there a flash time?

Flash time is required. For further questions, please contact your local Technical Representative for specific product recommendation.

5.   What is a PSA adhesive?

A PSA is an extremely tacky and sticky and stays tacky for the life of the adhesive. For further questions, please contact your local Technical Representative for specific product recommendation.

Wood Flooring

1.   Do I need to get all the old adhesive off the floor before I start?

Yes, slab must be contaminants free and well prepared before you can proceed with the Adhesive Installation. For further questions, please contact your local Technical Representative for specific product recommendation.

 

2. Do you sell it in a smaller quantity?

Yes, Bostik offers some available in cartridges as well as in 4 or 5-gallon bucket.

 

3.   How much glue do I need for my job, square foot coverage?

Based on flooring type and installation type, always refer to the product TDS. For further questions, please contact your local Technical Representative for specific product recommendation.

 

4.   What’s the difference between all the Bostik hardwood adhesives?

Varying moisture vapor protections, sound reduction/adhesive spacer, easy to trowel, no VOC, easy cleanup plus difference in polymer chemistries. For further questions, please contact your local Technical Representative for specific product recommendation.

 

5.   Can I install over old glue?

No, slab must be free of contaminants. For further questions, please contact your local Technical Representative for specific product recommendation.

 

6.   Will these adhesives bond to various coatings on my concrete? (moisture barriers, sealers, cutback, etc)

Based upon approved substrates in the technical data sheet. For further questions, please contact your local Technical Representative for specific product recommendation.

 

7.   What size trowel do I use?

Recommended trowel sizes in TDS based upon type of wood and application. For further questions, please contact your local Technical Representative for specific product recommendation.

Decoration and Paint

Q1. Can I paint silicone sealants?

A. No, paint does not adhere to a silicone sealant. If you need to paint the sealant after application, we highly recommend to use the Bostik H775 GLASS’N’SEAL PREMIUM PAINTABLE in glazing and façade joints. For more information please read the FactSheet FS006 Tolerance of sealants with paints.

 

Q2. I have painted my acrylic sealant but I cracks right in the middle on all joints?

A. This is reoccurring compliant that happens every once in a while. Reason why this phenomenon occurs is that during curing acrylic joint will show shrinkage because of evaporation of water which is part of all acrylic formulations. If you overpaint the acrylic joint to soon full retraction of joint isn’t complete yet and paint isn’t flexible enough to withstand this deformation, causing cracking of the paint. If you look closely the sealant isn’t cracked only the paint.

 

Q3. I have painted a Hybrid an my solvent based paint won’t dry?

A. With the application of hybrids which are to be painted you should be aware that solvent based (synthetic) paints can show a curing delay. Bostik H775 GLASS’N’SEAL PREMIUM PAINTABLE is a unique formulation within the hybrid product group which is fully paintable with synthetic and water based paints.

Energy Saving

Q1. I have applied your PU Foam but the product just falls out of the joint I want to fill?

A. This is probably caused by unfavorable circumstances. A lack of moisture (very low air humidity) leads to inefficient curing of the foam and to poor final properties. So always pre moisture the surface/joint with a plant sprayer apply your Bostik PU Foam and after application moisture one more time.

 

Q2. I have a can of PU Foam when activated the PU Foam doesn’t comes out?

A. In that case your can of PU Foam was stored in a lying position which allows the solids in the can to clog the valve and activation isn’t possible anymore. Always store cans upright between +5°C and +25°C to avoid stuck valves. Do not try to activate the valve by means of excessive opening of the valve with nails, screwdrivers etc. bring your canister back to your distributor and request a working substitute.

 

Q3. I have used a gun grade PU Foam but after an hour and a cup of coffee my gun wasn’t working properly anymore.

A. Normally nothing would happen if you put away the can with the gun attached, we suspect that after use the end of the gun has not been cleaned with PU Foam Cleaner. This allows residues of PU Foam to harden and partially or completely clog the gun as a result.

Expanding Foam

Q. I have applied your PU Foam but the product just falls out of the joint I want to fill?

A. This is probably caused by unfavorable circumstances. A lack of moisture (very low air humidity) leads to inefficient curing of the foam and to poor final properties. So always pre moisture the surface/joint with a plant sprayer apply your Bostik PU Foam and after application moisture one more time.

 

Q. I have a can of PU Foam when activated the PU Foam doesn’t comes out?

A. In that case your can of PU Foam was stored in a lying position which allows the solids in the can to clog the valve and activation isn’t possible anymore. Always store cans upright between +5°C and +25°C to avoid stuck valves. Do not try to activate the valve by means of excessive opening of the valve with nails, screwdrivers etc. bring your canister back to your distributor and request a working substitute.

 

Q. I have used a gun grade PU Foam but after an hour and a cup of coffee my gun wasn’t working properly anymore.

A. Normally nothing would happen if you put away the can with the gun attached, we suspect that after use the end of the gun has not been cleaned with PU Foam Cleaner. This allows residues of PU Foam to harden and partially or completely clog the gun as a result.

Grabs & Adhesives

Q1.  What is initial Tack?

A. A product with initial Tack provides you the opportunity to adhere a heavy object without any additional support to a surface (wall, ceiling etc.). Initial tack does not mean you have a higher strength after full curing, it may be that products without initial tack obtain an equivalent final stretch after curing. Initial tack solves a problem for you if it is not possible to glue certain items without any support.

 

Q2. I have an Hybrid grab Does this product contains solvents?

A. None of our hybrid or acrylic grabs contain solids.

 

Q3. Does Bostik offers a water resistant Adhesive?

A. Bostik offers a Grabs & Adhesives portfolio to the markets with solutions for all general needs we encounter in our day to day job. Water resistance is one of them, Bostik produces a solvent free D4 water resistant extreme high strength polyurethane power adhesive for a wide range of applications

Sanitary

Q. Although I have used a sanitary sealant, there is still mould. How is this possible?

A. Anti-mould additives are used to protect the sanitary sealants to prevent mould growth for a long period of time. However, if ventilation is poor or soap residue remains on the sealant joint for long periods of time, the anti-mould properties can be affected. Also cleaning the sealant with chloride based cleaners will negatively affect the protection evenly quicker. Once the mould protection is affected, Fungi can develop at a humidity of 65% and grow even faster at higher humidity. For more information please read the FactSheet FS014 Fungi resistance of sealants.

 

Q.  I have sealed my bathtub with a premium silicones and it cracks?

A. You have probably sealed your bath as it was empty with your premium silicone sealant. Bostik always recommends that you let the bath fill up before sealing and only then apply the silicone sealant. This is because deformation always occurs when the bath is filled, this deformation between the bath and the wall creates an enormous stress on the silicone sealant with the result that the silicone sealant ruptures. So fill the bath, finish with silicone sealant, let it cure and drain again.

 

Q. I have bought a Silicone sealant and applied it in my toilet, now all joints are discoloring (yellowing)?

A. We suspect that you have used an neutral silicone and that you toilet doesn’t have a window. In that case neutral curing silicone sealant can discolor, this is caused by the lack of UV light exposure. Your solution is to buy a acetoxy (sour/acid-smelling) silicone to avoid yellowing, Acetoxy silicone are not sensitive to discoloring in areas where there is lack of UV light exposure.

Tile Adhesives & Grouts

1.   How long Tile Adhesive Mortars to cure before I grout?

Based upon the type of tile, where it’s being used, type of substrate and type of mortar being used. Please refer to the TDS for specific product recommendation and specification. For further questions, please contact your local Technical Representative for specific product recommendation.

2.   How much water is needed, how do I mix less than a full bag?

Please refer to the mixing instructions on bags and TDS. For areas where you will be using less than full bag mix, weigh powder and measure water based on the bags or TDS instructions. For further questions, please contact your local Technical Representative for specific product recommendation.

3.   Which Tile Adhesive Mortar to use?

Based upon the type of tile, where it’s being used and type of substrate. For further questions, please contact your local Technical Representative for specific product recommendation.

4.   Should it be modified or non-modified?

Recommended based upon the type of substrate and tile. Refer to the specific TDS for further information. For further questions, please contact your local Technical Representative for specific product recommendation.

5.   Will the mortar bond to various substrates?

Refer to the TDS for specific approved substrates. For further questions, please contact your local Technical Representative for specific product recommendation.

6.   What size trowel do I use?

Based upon tile size and where it is being installed. Please refer to the product TDS for specific recommendations. For further questions, please contact your local Technical Representative for specific product recommendation.

Glazing

Q1. I have sealed my plastic windows now the glass is cracked?

A. This probably concerns a PMMA-PLEXIGLASS or POLYCARBONATE glass. If so, cracking of your glass is called stress cracking, stress cracking is the effect on the surface of plastic materials with a very low surface tension. Apply on this type of plastics only pure neutral silicone sealants without mineral plasticizers in our case Bostik S780 GLASS’N’SEAL PREMIUM.

 

Q2. Can I use your glazing products for single and Insulation glass?

A. At Bostik we offer a wide variety of glazing product for any kind of glazing methods, single and monumental glazing and off course insulation glass.

 

Q3. If I use your Hybrid glazing product, it sticks to my glazing tools.

A. Our hybrid product are very easy to apply and tool, however you need Bostik Finishing Soap to avoid your Hybrid to stick on your tooling materials.                                                                                                                                                                              

Wall Adhesives

Q1.   Which Wall Adhesive to use?

Based upon the type of tile, where it’s being used and type of substrate. For further questions, please contact your local Technical Representative for specific product recommendation.

 

Q2.   Will the mortar bond to various substrates?

Refer to the TDS for specific approved substrates. For further questions, please contact your local Technical Representative for specific product recommendation.

 

Q3.   What size trowel do I use?

Based upon tile size and where it is being installed. Please refer to the product TDS for specific recommendations. For further questions, please contact your local Technical Representative for specific product recommendation.

                                                                                                                                                                  

Wall Preparations

Q1.   What are the Wall Preparations products available?

Wall Preparation includes, Plaster preparation, Filler, Multifunctional coating, and Smooth coating

 

Q2.   What is Bostik Lissepur Coating?

Bostik Lissepur coating, is a smoothing coating characterized by reducing the formaldehyde content in indoor air by up to 80%. The thermally insulating leveling coating reduces heat loss by up to 15% and reduces the feeling of a cold wall.

 

Q3.   What size trowel do I use?

Based upon the application and where it is being installed. Please refer to the product TDS for specific recommendations. For further questions, please contact your local Technical Representative for specific product recommendation.

                                                                                                                                                                  

Floor Preparation

1.   How clean must the subfloor be, ground, some old adhesive, etc.

Scape to stain, no oils, grease, dirt or any type of contaminants. For further questions, please contact your local Technical Representative for specific product recommendation.

2.   Can I pour it over, carpet, old vinyl, existing finished wood flooring, tile, etc.?

Bostik recommends Tile as an approved substrate as long as the current substrate is clean, well-bonded and free of all contaminants. All other substrates are not recommended. For further questions, please contact your local Technical Representative for specific product recommendation.

3.   Do I have to add lath to the substrate?

Depends on substrate, Bostik required lath for single layer plywood. Concrete slabs in good conditions and properly prepared to received our products are not needed. For further questions, please contact your local Technical Representative for specific product recommendation.

4.   Do I need to prime?  What dilution or full strength?

Yes, primer is required in order to prevent future failures. For further questions, please contact your local Technical Representative for specific product recommendation.

5.   Do I have to prime between coats?

Yes, you must apply a coat of primer between coats. For further questions, please contact your local Technical Representative for specific product recommendation.

6.   Can I mix the product to feel?

No, each product is designed based on product performances., Please refer to the specific product TDS for water demand and mixing instructions. For further questions, please contact your local Technical Representative for specific product recommendation.

7.   How long should I mix it? Do I need to let it slake?

Always mix the material until is free of lump and it has reached a homogenous mix. No need to slake. Please refer to the specific product TDS for mixing instructions. For further questions, please contact your local Technical Representative for specific product recommendation.

8.   Can I add more water if it feels thick or won’t flow like I want it to?

No, each product is designed based on product performances., Please refer to the specific product TDS for water demand and mixing instructions. For further questions, please contact your local Technical Representative for specific product recommendation.

Bulletins :

Construction and Facade
Decoration and Paint
Energy Saving
Fire Protection
Grabs & Adhesives

More about Bostik ACADEMY :