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Old 09-09-2016, 03:17 PM   #1
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Cleaning The Roof

About 10 months ago we coated our roof with EPDM RV Rubber Roof Coating. When it was done it looked fantastic. Very soon after we finished, the entire roof started to get gray spots and streaks that have gotten much worse over time. It now looks worse than before we coated it. The roof seems to be sealed fine and we have no leaks. But it looks older than the coach. I contacted EPDM Coatings and their response after I sent them the attached photo is that it probably is mildew and I should go and get a product with a mildewcide to clean it. I have tried every product known to man and nothing will touch the spots. So two questions. Does it sound reasonable that this product should mildew so bad? Does anyone have a suggestion on what might clean the roof without damaging it? Chuck

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Old 09-09-2016, 03:47 PM   #2
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I assume you've tried a mixture of soap and bleach, along with a soft brush..
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Old 09-09-2016, 04:33 PM   #3
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I can't comment on "reasonable" because there are such huge differences in the environment that RVs are exposed too. And application technique varies as well.

If a brushing with a good detergent plus a hefty dose of beach won't clean it, I'm afraid you are out of luck.
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Old 09-09-2016, 05:39 PM   #4
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Better not clean with anything but rubber roof cleaner
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Old 09-09-2016, 07:16 PM   #5
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I use soapy water and a brush. Won't hurt it.
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Old 09-09-2016, 09:28 PM   #6
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I have used all of the above with no success. Chuck
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Old 09-09-2016, 10:03 PM   #7
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Quote:
Originally Posted by chuckbear View Post
About 10 months ago we coated our roof with EPDM RV Rubber Roof Coating. When it was done it looked fantastic. Very soon after we finished, the entire roof started to get gray spots and streaks that have gotten much worse over time. It now looks worse than before we coated it. The roof seems to be sealed fine and we have no leaks. But it looks older than the coach. I contacted EPDM Coatings and their response after I sent them the attached photo is that it probably is mildew and I should go and get a product with a mildewcide to clean it. I have tried every product known to man and nothing will touch the spots. So two questions. Does it sound reasonable that this product should mildew so bad? Does anyone have a suggestion on what might clean the roof without damaging it? Chuck

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Possible what you see (mildew) is from before you coated the roof and now it's bleeding through. Very important to clean the roof before applying the roof coating.

Diluted bleach may work.

What type of roof coating did you use?
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Old 09-10-2016, 09:38 AM   #8
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Possible what you see (mildew) is from before you coated the roof and now it's bleeding through. Very important to clean the roof before applying the roof coating.

Diluted bleach may work.

What type of roof coating did you use?
Highly unlikely. According to your signature, my roof should be the same as yours, a rubber roof. With the primer and the coating required by the manufacturer, there is no way anything from the original roof is coming through. The roof was thoroughly cleaned before the process. If not, the product would not stick, rather than mildew coming through. As I said in my original post, this is EPDM Rv Rubber Roof Coating. Chuck
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Old 09-10-2016, 01:50 PM   #9
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Highly unlikely. According to your signature, my roof should be the same as yours, a rubber roof. With the primer and the coating required by the manufacturer, there is no way anything from the original roof is coming through. The roof was thoroughly cleaned before the process. If not, the product would not stick, rather than mildew coming through. As I said in my original post, this is EPDM Rv Rubber Roof Coating. Chuck
Yeah, the roof is a rubber roof made by Alpha. Alpha recommends the
#80299 – Superflex Rubber Roof Coating (coverage is 200 SF/gallon)
#80297 – Superflex Adhesive and Primer (coverage is 160 SF/gallon)

This was on my do list for next summer. The product I was going to use is Liquid Roof, a product of EPDM Coatings. May have to do more research on products now.

Hopefully, someone can charm in that experience the same issue you have. keep us posted if you find a fix.
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Old 09-10-2016, 02:02 PM   #10
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As I said twice now, The Liquid Roof is the product I used. This has been a major disappointment. Especially with how expensive it is and all the work it takes to put it down. Next time I'll use Dicor. Chuck
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Old 09-10-2016, 03:27 PM   #11
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Better not clean with anything but rubber roof cleaner
LOL! They must love you at Thetford and Camco. They have dozens of RV cleaner products to sell you. Tank chemicals too.
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Old 09-12-2016, 05:32 PM   #12
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I use the Dicor roof cleaner, once every clean the roof, then in between just use clean water. But we had our MH for three years. Keep it covered six to seven months of the year
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Old 09-13-2016, 08:48 AM   #13
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Ask the roof supplier again specifically what products to use that can aggressively get the stuff off without harming the warranty.

First question is when it was applied was it fully cured and clean?

We did one and it took awhile to cure and it has a few bees and other things in it for life.
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Old 09-13-2016, 09:40 AM   #14
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I use the Dicor roof cleaner, once every clean the roof, then in between just use clean water. But we had our MH for three years. Keep it covered six to seven months of the year
On my 18 year old rubber roof I have never used any cleaner or protector product and it still has never leaked or looks bad. Just lately showing some areas the white is a little thin.

I do pressure wash it 2 times a year too get rid of the green like mold(FL) that likes to grow on it. I have used a 1500 and 1700 PSI washers so far with a wide fan.

It has been outside 24/7 for the 18 years.

When it needs replaced I will probably go with RV FlexArmor 10-15 Years
or RV Armor Lifetime
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