Fiberglass Clean and Prep

Washed the roof with dish soap and bleach first. Thought it was pretty clean and didn't think that this cleaner would do much after the first wash. Wow I was wrong. Liquid is a red colour and once I started to scrub it the foam turned brown quite quick. Figured it had somthing to do with the red colour. After the good scrub and a decent rinse I decided to do a second scrub with fresh cleaner. Foam had no colour to it so I figured it's clean, and I can move on to the coating step next. Takes a lot to be happy with the rinse, I scrubbed and rinsed at the same time. Sun dry for few hrs then into garage for the night with fans blowing on it. After morning dew I brought it back outside.

The cleaner does an excellent job of preparing the fiberglass roof for the protective coating. Make sure you follow all the instructions.

Good

It's ok, cleans roof surface yeah with slight red brown hue remaining. Other cheaper alternatives work too without the stain. So you choose.

I used this on the fiberglass roof of our class C motor home in preparation for coating with the Dicor coating. First off, I can’t strongly recommend enough to cover your rig with plastic and be sure to seal along the edge of the roof. This stuff WILL eat the finish off of the sides of the rig. The runoff found a couple of small weap holes and I now have two streaks to compound and wax. I followed the instructions to the letter and it prepped out beautifully. My sneakers even squeaked on the prepped surface, just like the video mentions. When you first spray it on, it will almost immediately turn an amber yellow. Oh, and it stinks really bad!! When it is scrubbed in, it becomes very easy to see exactly where you have scrubbed as the fiberglass turns from ashy white, to a sort of yellow color. I’m convinced that the prep work is why the coating went on beautifully. Just be sure that the roof is completely dry , but I’ll talk about that in the coating review.