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Old 02-03-2013, 09:09 PM
98Prostar205 98Prostar205 is offline
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Join Date: Apr 2012
Boat: 1998 Prostar 205
Location: Alabama
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Remove Silicon from Gelcoat

I am replacing my exhaust flanges on my 98 prostar 205. I got the old ones off. Now I need to remove the old silicon type stuff from the gelcoat. What is the best method? Also, the old ones had this silicon stuff on the inside diameter of the holes in the transom. How do I reapply new sealant in this area when I get ready to install the new flanges?
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Old 02-03-2013, 09:53 PM
waterlogged882 waterlogged882 is offline
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Old 02-03-2013, 09:54 PM
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Lumbergh Lumbergh is offline
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I used a plastic putty knife and Goo-Gone to clean up the old RTV stuff behind the flanges.

Was a time consuming job, but got down the gel coat and clean with time.

Used black RTV to seal new flanges, the RTV will ooze everywhere including the bolt holes when the flanges are reinstalled to transom with screws.

Some use 3M 4200 or 5200 to seal flanges. Silicon style product was good enough for MC, so good enough for me. Mine sealed fine.

YMMV.

PS - I was able to reattach exhaust hoses and 2x hose clamps (each) with fuel tank installed. Just some light, laying down and a 1/4 socket wrench.
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Old 02-18-2013, 12:29 PM
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Thrall Thrall is offline
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