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BOSTI-SIL 25™

100% RTV Silicone Sealant
Product overview

Bostik BOSTI-SIL 25 is an easy to apply, one component sealant that cures to a durable, flexible, silicone rubber upon exposure to atmospheric moisture while giving off a small amount of acetic acid. 
BOSTI-SIL 25 has been specifically designed for fast curing and excellent adhesion to non-porous surfaces such as glass, metals and ceramics. BOSTI-SIL 25 is a highly flexible silicone sealant that accommodates joint movement of +/- 25%.
BOSTI-SIL 25 has been developed for building construction and industrial sealing application, particularly effective for glazing joints and sealing curtain wall applications. BOSTI-SIL 25 applications include: weather sealing, top sealing in glazing applications, weatherproofing between glass and aluminum, general industrial uses and hygiene seals in refrigeration.

Geographic availability
  • United States of America
Available sizes
10.1 oz cartridge - 12/case

Smart Advantages

 
Interior and exterior use
Joint movement of +/- 25%
Extreme weather resistance
Bosti-Sil 25 FAQ
Is using Silicone caulk safe?

Silicone caulk is generally recognized as safe. It should always be used in a well-ventilated area. Other standard safety precautions are listed on the side of each tube of BOSTI-SIL 25.

Is it waterproof?

Yes. BOSTI-SIL 25 can be used in applications where keeping water out is a necessity. We do not recommend using this product for full submersion applications (swimming pools, whirlpools, etc).

How do I remove uncured silicone caulk?

Scrape or wipe as much uncured caulk as possible. To remove residual uncured caulk, wipe application area completely with isopropyl alcohol. Be sure that the work area is well ventilated and follow all safety precautions and instructions listed on the product label or as otherwise provided by the manufacturer.

How do I remove cured silicone caulk?

Using a scraper or razor blade, remove as much cured caulk as possible from the surface. For ceramic tile, marble, etc use 100% mineral spirits and a nonabrasive scouring pad. (Be sure to test for discoloration on a small or hidden area prior to application.) For glass, use a razor blade, removing as much as possible, then apply mineral spirits. Remove excess with a towel or other cloth that will not mark the surface area. For hard plastic or painted surfaces, use rubbing alcohol and soft cloth. Do not use mineral spirits. For porous surfaces like brick or concrete, use a wire brush and mineral spirits to completely clear area of cured caulk. Be sure that the work area is well ventilated and follow all safety precautions and instructions listed on the product label or as otherwise provided by the manufacturer.

Does BOSTI-SIL 25 smell?

All caulk releases some level of odor during its cure cycle, generally within the first 24 hours after the product is applied. BOSTI-SIL 25 is an acetoxy cure caulk and will have some smell associated with the cure of the sealant.

Do I have to prime before using BOSTI-SIL 25?

No. BOSTI-SIL 25 can be applied with conventional hand or air powered caulking equipment to primed or unprimed surfaces.

For Interior use am I limited in use?

While BOSTI-SIL 25 and other silicone caulks are formulated for the demands of outdoor environments, they are also suitable for kitchen and bath applications.

Is BOSTI-SIL 25 Paintable?

100% silicone products are not paintable. If your project requires painting, we recommend using Duo-Sil Ultra™, which is paintable, waterproof, and also has the flexibility of traditional silicone caulks.

What is the typical drying or cure time for silicone caulk?

A 3/16 bead will normally cure in 24 hours. The cure time may vary depending environmental conditions like high humidity, as this will make the cure process slow down. In cooler or dryer conditions, you can expect a cure time of up to 48 hours which is the typical drying or cure time for silicone caulk.

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