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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
Posts: 84
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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Join Date: Dec 2004
Boat: 93 190
Location: lake
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John 14:6

Last edited by waterlogged882; 09-13-2015 at 04:47 PM.
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Old 02-03-2013, 09:54 PM
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Lumbergh Lumbergh is offline
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Join Date: Aug 2011
Boat: 1991 ProStar 190
Location: Seattle
Posts: 806
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.


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.
1991 ProStar / 351W with 1:1 Velvet Drive
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Old 02-18-2013, 12:29 PM
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Thrall Thrall is offline
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Join Date: Jul 2004
Boat: '06 X2 MCX
Location: Black Diamond, WA
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Single edge razor blade and or a 3M eraser wheel.
'06 X2 MCX

"I understand why some people may not want to do this the way I have recommended but I can't understand the death grip some people have on a toilet plunger with a hose fitting." -JimN
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