Join Date: Nov 2006
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There are almost no chemicals to remove old silicone or sikaflex products, and the existing ones weaken the gelcoat.
What I do, when I need to remove it, is a sharp exacto blade and a piano wire, with two handles, that you skeeze on one end and pull/push all the way around. Like a saw. Hope I explained ok...
Once removed the port, you scrape the rest with the knife and accetone.
It's hard to remove, and has to be "mechanical" removal, not "chemical".