The DIY fixes for the bubbles are tricky and not guaranteed to work.? The problem is caused by a bad batch of glue used by the factory.? That means you have deteriorated glue in there that may make bonding new glue a problem.
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If you do want to try and fix it, drill a small hole (1/16th inch) in a bubble to let the air out, and in the morning before the sun hits the roof and expands the bubbles, see if you can push the bubble flat with your hand with a reasonable amount of force.? If you can, then you can fix it by injecting epoxy through holes you make in the roof skin.
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?You're going to drill small holes through the roof skin every 4 inches or so, inject epoxy, and then press the bubble flat with a board.? You dont want to glue the board to the roof, and you don't want to cover the roof with epoxy that oozes out the holes when you squeeze the bubble flat.? You probably can't do the whole roof at once, because you can't pile that much weight on top to press all the bubbles flat, because that would be more weight than the roof can support, and you have limited working time for the epoxy.? So you'll have to work on 2 or 3 square feet at a time.??
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The way I did that for a small area of delaminatiin was to cover the area with blue painters tape, then drill the board with 1/4" holes about 4" apart, then lay the board on the roof, and drill 1/16th" holes in the center of the 1/4" holes through the roof skin.? Then cover the board with a piece of wax paper, and poke holes through the wax paper where the holes in the board are.? Then inject the epoxy through the roof skin using "dental syringes", push the bubble flat a bunch of times with your finger over the hole to squish the epoxy around.? After all the epoxy has been injected, lay? the board wax paper side down matching up the holes, and weight it down.? The excess epoxy will squirt up though the holes, but won't get on the roof.??
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After the epoxy dries, remove the board, and trim off the excess epoxy with a single edge razor blade.? Don't sand it off.? Sanding requires requires tons of work using finer and finer grit sandpaper and rubbing compound to get the shine back.? Then to paint the epoxy in the hole, I just use a dab of fingernail polish.
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Be sure to use 24 hr epoxy, not the 10 minute stuff.? 24 hr epoxy will give you maybe 30 minutes working time before it starts to set.? Put the epoxy in the fridge before you use it, and don't do the repair on a hot day.??
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My bubble was near the vent and I found a giant C clamp that I used to push part of the bubble flat.? Your bubbles are probably too far from any opening to use a C clamp, but you might be able to fabricate something with boards and bolts, if you find the bubbles are too stiff to push flat with weights.
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Another approach to the bubbles is to grind slits in them, so they lay flat much easier.? Then glue them down, sand off the edges of the slits, cover with fiberglass cloth and epoxy resin, then sand smooth and paint the whole roof.? But that takes skilled work and is a whole lot more time consuming.??
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Let us know what you decide.? I've seen some roofs that had so many bubbles I wouldn't bother with a fix.? Others have also replaced the entire roof, but that costs 6k and is more than the trailer is worth.
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