The AC leak prior to our owning our 1988 Bigfoot
B19 (mentioned in my post about the fiberglass ripples or wrinkles)caused some of the core to swell, creating an uneven surface around the AC roof opening. Per the suggestion of a fiberglass repairperson, I did my best to seal the areas where the fiberglass had separated from the core, but the roof is still uneven around the AC opening. The instructions for the AC state that it must be placed on a level surface and suggest creating a shim if the surface is uneven. Well, if there were an uneven slope in only one direction, that would be easier to do, but in this case one or more of the 14 x 14 sides of the opening has an undulation in it so one could not just slap a shim the length of it and have it be even. It needs an indentation filled in in one part, but then there's a raised area before there's another indentation. So, I am at a bit of a loss on how to create a level square surface upon which to place the gasket and then the AC (and make it all water tight) and we want to go to that Rally
this weekend, but I am starting to feel that I won't possibly get this done in time.
Has anyone else had to remove and then reinstall an AC on an uneven roof...and if so, how did you even it? Thanks for your suggestions!
I just had the idea of sanding the gel part of the finish off of the surface to be leveled, then using epoxy paste or putty to create a level surface, which I could then paint
. Since it would be under the AC body and shroud, it wouldn't be visible, so as long as it is waterproof and holds up well, it doesn't matter if it matches the rest of the trailer body.
Any thoughts on this before I go to Home Depot to buy these supplies? Is there some other material I should be aware of? I am going to call the fiberglass repairmen to see what he thinks.