Flash Coat
Below are some pictures of what a flash coat looks like. Notice that it is so thin you still see the original roof through the light coating of RvRoofMagic.
The purpose of the flash coat years ago was to avoid customer calling in about concerns that their roof had bubbled in certain places. This flash coat avoids any potential temporary bubbling. Depending on the age of your epdm roof and the condition of the glue holding down your original EPDM membrane more solvents will be absorbed into the EPDM and without the flash coat could potentially result in temporary bubbling. The flash coat should dry within 45 minutes depending on temperature and will block any additional solvents from being absorbed into the rubber thus minimizing the occurrence of bubbling.
If you do not first apply a flash coat you run the risk of too much solvent being absorbed which will cause the coating on your original EPDM membrane to swell. This will require additional days in the time it will take to reduce in size depending on you day and night time temperatures as well as humidity and dew points.
