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Old 08-16-2016, 07:53 PM   #1
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What to do to roof

I got a 99 motor home with fiber glass roof every time it rains white chalk like runs down the the side what can I treat it with to stop it
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Old 08-16-2016, 08:53 PM   #2
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A good washing or two with baby shampoo and vinegar - could also use any decent car washing fluid. Rinse very well - then a coating with Zep, 303 Protectant or any good quality liquid wax/sealer - put it on with a mop to make it a little easier. While your up there check your seam sealants really well - best to clean those up and re-seal as necessary ...
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Old 08-17-2016, 03:51 AM   #3
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If you have a rubber membrane roof, that's UV light breaking down the rubber.

I had a lot of this on mine and decided to re-coat it. I'm very pleased with the results, and no more white streaks.

Re-coating EPDM roof | 2001 Coachmen Mirada 300QB

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Old 08-17-2016, 08:01 AM   #4
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Many of them had aluminum roofs, are you positive yours is fiberglass ?
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Old 08-17-2016, 08:50 AM   #5
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Regular washing with a good car wash liquid is the only way I've found!
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Old 08-17-2016, 09:53 AM   #6
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If fiberglass, Country Coach Inc recommended applying Formula 303 a couple of times per year.
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Old 08-17-2016, 11:12 AM   #7
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Once the fiberglass (or the roof paint) begins to chalk, the only permanent solution is to re-paint it. Dicor makes a Fiberglass Roof Coat (paint) that works well, though it is pricey. You could also use a marine deck paint or an automotive paint, anything intended for exterior use in full sun. Just clean & prep the surface and paint. I did mine in about 6 hours, including a second coat.
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