Bostik 920 – 10oz Silicone Caulking Tube

Bostik Caulk


Bostik provides high quality caulks that rival or beat the competition. Offered in black or white colors and is perfect for marine, cars, trucks and motorcycle applications.


Bostik High Quality Silicone Caulk


920 is a one-part, gun grade urethane sealant/adhesive that moisture cures to an extremely tough, resilient seal which exhibits excellent tear and abrasion resistance while retaining permanent elastomeric properties. It has tenacious adhesion to most common marine substrates including virtually all woods, metal, FRP and most plastics.

This product is recommended for any marine application above or below the water line where a quality elastomeric seal is required. It is suitable for sealing hardware around windows and doors, deck to hull assembly, hull seams, keel joints and under moldings.

However, 920 it is not designed as a glazing sealant in which the adhesive bond to glass is exposed to sunlight and appreciable amounts of ultraviolet radiation. 920 should NOT be used when the temperature is below 40° F.

Bostik Caulking Product Highlights:

  1. One part, gun grade urethane sealant/adhesive.
  2. Moisture cures to an extremely tough, resilient seal.
  3. Exhibits excellent tear and abrasion resistance while retaining permanent elastomeric properties.

PLEASE NOTE: This information is provided in good faith and correct to the best of our knowledge. No warranty, guarantee, or representation is made as to the sufficiency of the information for the safe use of the product, nor to relieve the end user of any Federal, State, or Local regulatory responsibility.

Bostik Silicone Instructions

The product is best used at temperatures between 65°F and 80°F. Temperatures below 65°F will slow the cure speed of the material and viscosities will be higher. Temperatures above 80°F will cause the material to cure faster and viscosities will be lower. For consistent dispensing maintain temperature in the above mentioned range. For optimum bond strength and to insure maximum performance in the finished assembly mate parts together within the specified work time of the adhesive. Make sure the bond joint has uniform coverage and that a sufficient amount of adhesive is in the bond area. It is important to have the adhesive applied, parts aligned and positioned, within the established work times for the product. To ensure maximum performance in the finished assembly parts should remain undisturbed until the fixture time is reached.


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    “I love fiberglass coatings. They have great products and excellent advice. I'm trying to open a boat repair shop in St . Mary's, GA and my supply WILL come from fiberglass coatings. When I lived in the Fl. Keys for 36 years and worked for a towing and salvage Co for 15 years all our supplies came from Fiberglass coatings. Great service and never were disappointed. Keep up the great job everyone.”
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  3. Justin Lammers

    “Been working on a skiff project and using all FGCI products. They came highly recommended by my friends who are boat builders. It is the highest quality resins, glass, and gelcoat for the money. They made it really easy for a newer person to boat building. The customer service is phenomenal and they are always knowledgeable and ready to help with any questions I had.”