Instruction: Output yes if the supporting document can answer the given question. Otherwise, output no.

Input:
Question: Can I paint this over the kool coat I have on my roof now, or must I etch, sand or prime it first. It's old and pretty worn.
Document: This appears to be a great product. I won't know for sure until my travel trailer goes through a few seasons but my first impressions are excellent. It is really messy to work with but you can clean up with paint thinner pretty easily. I worked out of 1 gallon cans of the product. I prepared the rv roof first be repairing any pre-existing damage and making sure all the existing caulking around vents, etc. was in good shape. Any loose caulking was replaced with dicor brand epdm lap caulking.
This is a thicker coating and was pretty simple to put on, so far we have had rain and it seems to be keeping the rain out of my Class C motor-home. It was applied by paint brush, 2 coats were put on, about 36 hours apart.We cleaned of the old stuff and coated the areas in question and around all possible areas on my roof. So far so good, I hope it lasts for 5 years like it claims too.
I then pressure washed the roof and let it dry. Then I prepped my first gallon of liquid roof and covered all areas that I could not roll easily. After that I combined 3 gallons into a 5 gal bucket and mixed. I rolled the coating with a 1/4" nap roller and applied it as thick as I could with the roller. The finished roof looks great and I'm pretty sure it will last for years.
I cleaned up all the loose stuff the best I could and cleaned the roof. I applied the Liquid Roof by pouring it on and using a short nap roller to push it about. I also used a paint brush to brush it around and in any seams and around vents. This stuff is very thick and not easy to work with.According to the directions, about 3 gallons is needed for a coat on my roof of 20 foot. I read that after I used the 2 gallons I had.
Amazon.com was the most affordable price I could find on a RV specific EPDM roof coating. All other brands out there are much more pricey or are not legitimately compatible with an EPDM rubber roof. The product came with a bottle of catalyst which must be added to the paint and stirred thoroughly before using. It recommends using a drill with paint mixer to make sure its mixed thoroughly. Follow the indicated application instructions, or research on internet ([...] Scrape any flaking of previous coating.
This is the PERFECT product to caulk rubber RV roofs. I wash the roof, let dry, sand the seams lightly with 60 grit paper, blow it well with leaf blower, then mix a quart up,(1/4 of the gallon can, 1/4 of the catalyst) save half of the mix in a peanut butter jar in freezer. The first half is just getting too sticky to brush easily when it is about used up, the second half is still good to go.
), and roll out with paint roller. Keep working back and finish at the ladder. Allow to dry & cure for 2 days. 2 cans was plenty for one coat on a 27ftx8ft RV. Maintain surface by cleaning annually with bleach/water/detergent (do not use deck brush) and checking for rips/tears/holes. Reapply coating every 5 years. Only negative for me was darn bugs landing on it when it was wet and now I have bug "fossils".
Because there was a threat of rain the next day I applied the liquid roof in one day. I got up early to scrub and wash the roof then waited until afternoon to put the liquid roof on while the camper dried in the sun. It took about 3 hours to coat the roof and I finished just before sunset. It covers better than they claim. It only took two gallons to finish with a little left over.
I've caulked leaks on my camper roof for a number of years and was frustrated that the leak never seemed to be fixed. Found this product on line, watched a few videos and saw how easy it was to do, bought the product. All has gone as the manufacturer has described. My camper is 10.5' and one gallon covered the entire roof. Wish I had done this in the first place.
I'm sure they will weather off over time. Aside from the bugs the roof looks great and doesn't leak.Update 8/6/13It has been 2 months since I coated my camper and no leaks even though it rained almost every day in June and July was the hottest on record. I wish I had put on the liquid rubber right away when the leaks first appeared rather than wasting time with tapes and caulk.
Answer: yes