
09-27-2011
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Just another Moderator
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Join Date: Sep 2005
Location: New Westminster, BC
Posts: 9,277
Rep Power: 9
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JKC's method ought to work... you may be able to get under one corner and start cutting the sealant that way. Use a small gauge non-wound guitar string maybe, and put small dowels on each end to hold onto (think garrotte  ).
A thin but stiff putty knife, a hammer and a LOT of patience might get you going too. But I think that either of these methods is not necessarily guaranteed to do no damage to the windows. Acrylic is not that expensive so replacing them in the event that you crack one is not the end of the world, and planning to do so does somewhat simplify the removal process.(ie if you're not worried about salvaging the old portlights)
We've had great success with Dow Corning 795 as a sealant/adhesive in that situation when it comes to rebedding. Be sure to drill any screwholes considerably oversize to allow for the large difference in expansion between acrylic and fiberglass.
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".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345
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