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can RVroofmagic be applied over a roof that has been treated with 303 Aerospace?

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20 year old EPDM roof on 34' RV.  Purchased this year.  the roof looks in fairly good condition.  the black is starting to show through in places but there are no rips or holes..  I have some repairs to make on the roof and want to wait until spring..   2 of the repairs will involve replacing rotted wood,  the rest will be slitting the rubber roof where it has lifted to apply glue (mostly around the edges),   I've already recalked  where necessary with Dicor self leveling calk to protect for the winter.   I was going to apply 303 aerospace marine sealant to the roof for further protection for the winter but now im thinking that it may not be a good idea.   If i use 303, will i need primer?   If i do not use 303, can i skip the primer?   Thank you for your replay.  Sincerely, Rick.
asked Oct 28, 2018 in Liquid RV Roof Magic by Rick
edited Jun 3, 2021 by admin

1 Answer

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we would suggest  putting a flash coat down first then a full coat. No primer is needed  Please see below


If you have an existing epdm roof, it is important for you apply a very light coat (a flash coat, approximately 4 mil or the thickness of 2 pieces of paper). Failure to do so will result in swelling of the membrane which will require additional days for the product to settle. The final coat will be at a 16 mil thickness. Divide the length of your rv by the number of remaining gallons, this number will tell you the length of the sections needed for each gallon. For example, if your trailer is 24 feet long, you will need 4 gallons. One gallon will be for your flash coat. The remaining three gallons will be for the final coat. After your flash coat, divide your 24 ft long trailer by 3 (the number of remaining gallons) resulting in eight-foot-long sections. Each of your remaining gallons will cover one of these 8 ft section.

Thank you
answered Oct 28, 2018 by admin
edited Jun 3, 2021 by admin