The bubbles that form look scary - but dont sweat them.
If you have any Fantastic fan vents or Maxair vents over your roof vents, take them off before you start.
Clean off excessive globs of caulking you may have around the vents, roof racks and the joints where the roofing meets the front, back and side of your rv. Not all the caulking - just excessive huge mounds.
Mask off at least an inch beyond the perimeter of the roof, i.e, roof - edge of roof (front/back/side) - 1 inch - put masking tape here. When you paint on the EPDM paint all the way onto the masking tape. Wait at least an hour after you paint on the epdm to start setting up, then slowly peel the masking tape off. Not only will you have a nice straight line but you will have sealed up the joints all the way around the roof of the RV! Dont wait for the EPDM to fully set before you remove the masking tape or you will make a mess then.
Paint the EPDM over the edge of every vent on the roof and over the screws holding the roof vents in place. You have sealed up the edges of the roof vents for a good long time and you wont have to caulk them for a long time.
I painted the EPDM over the grey and black water vents on the roof. The plastic vents were looking a little rough from years of exposure to the UV and this will protect them and give them a few more years of life.
