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3M Marine Grade Silicone Sealant is a mildew resistant, non sagging, moisture curing silicone rubber adhesive sealant for above-waterline applications. Designed specifically for durability in the harsh marine environment, it provides non-yellowing seals that remain flexible even after years of exposure.
It adheres to and bonds bare and painted metal, glass, gelcoat, Lexan, Plexiglass, fiberglass, non-oily woods, abraded rubber, vinyl, and many plastics. Cures tack free in one hour, with full cure in 24 hrs. Use soap and water for cleanup.
Note: Silicone sealants are generally not as strong as polyurethanes. While it does have 220 psi tensile strength, evaluate project bonding and flexibility requirements beforehand.
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Excellent weathering resistance
High temperature resistant
Below Water Line (yes/no):
Rate Of Cure:
does it work on plastic windows ?
Does this come in black?
Sorry, just white or clear. 3M 4200 comes in black.
will this product accept a coat of paint?
I never tried it but if you are trying to paint it, you may be using the wrong product for your application. Silicone sealant is not an adhesive and should only be used between two mating surfaces and only above water. In short, properly used, there will be nothing to paint. If it is exposed and on one surface only, it will usually just peal off.
It seems in the past I did paint over it, but not 100% sure. It's a rather thick product and difficult to spread to a smooth finish so if you do paint it, it may look a little rough in that area. I do not believe it sands well.My recent use was for sealing new deck screws by dipping the screw ends into the sealant before fastening.Hope this helps
How long will it take for Marine Silicone Sealant to core?
Yes I would buy 3M silicone again
Your web site is easy to use & I received the products in a short time