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Hi Marco,

I recently became much more educated on Sika products after failing three times to successfully fasten a lexan window back into its frame. I contacted Sika and spoke with a factory representative. My mistake was the absence of a primer - - this may also be your problem.

Looking through the products on the Sika website it looks like the best product for your application will be the "Sika 221" but I would also recommend using the 215 primer for wood, plastics and composites. There is also a 208 product for cleaning prior to use, that will remover the existing Sika you have there from the failed attempt.

Hope this helps.

Best,

Captain Ian Fagg

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Hello Marco,

I have primarily used Sikaflex for sealant applications, and 3M products for bonding. From the Sikaflex line Sikaflex 252 seems to be the best bet for your application as it is a sealant and a bonding agent.

Surface prep is the key, you must remove all the old adhesive and make sure you wipe the area on the transom with acetone to remove any last traces of dirt, wax and old adhesive. Next, on the rubber "bumper" strip, give the side that you will be applying the adhesive to, a good hand sand with 80-grit paper. This will give the adhesive "tooth" to hold onto, and then wipe this with acetone as well before applying the adhesive.

To hold the bumper in place while you wait for it to cure, I would fasten some 2-inch blue low tack tape on the hull and the rubber in strategic spots (the ends and five or six in between, then duct tape across that. The blue tape is just to keep that nasty duct tape adhesive off of your gelcoat.

Hope this helps,

Captain Craig Bliss