Originally Posted by 530ktm
I use 303 on awnings and A/C covers but have never just sprayed the entire roof. My roof is fiberglass, do you just spray everything you can see up there and do you wipe it down or just spray and let it dry?
Well, I used to use NuFinish my fiberglass roof but didn't seem to do any more or last any longer than using 303. I know everybody has an opinion on what to use on the roof as there are plenty of threads on this. However, since I buy 303 in large quantities, I use it on a lot of things. I don't use it on any metal things on the roof, of course, but do use it on just about anything else including caulking and seams, shower skylight surface, vent covers, satellite dome, etc., etc. I know all will not agree but I use it on just about anything that isn't fabric or metal.
I'm not sure if the fiberglass even needs UV protection but I use 303 anyway as it seems to be easier to clean the next time. If you keep up the maintenance on a fiberglass roof, it won't oxidize where it needs a restorer/wax ...or so I've found.
Most places I'll spray it, let it sit for a minute or two (while I apply to another area) and then lightly wipe it down. Other places, I'll spray on a towel and wipe things down such as Dicor, any wire covers, etc. ...things where it doesn't make sense just to spray away.
Again, not everybody believes in 303 for all the things I use it for or use other products instead but I've been using it for over well over a decade and am very happy with the UV-protection it gives. UV exposure without some protection is such a damaging thing. My brother uses 303 on his tires and applies it on a regular schedule as he thinks it does just as well as using tire covers. I use 303 on my tires once a month but will occasionally use tire covers when in the desert for several months. Both of us have never had a problem with sidewalls cracking or showing any damage at all. My brother spends lots of time in the desert and has never covered his tires (desert is really irrelevant as UV damage can occur even under cloudy skies).
If you keep up a cleaning schedule on the roof, it actually is pretty fast and easy to keep it looking good and protecting it. If you let it go for awhile, then it's a pain to clean it and to get it back in shape.