I read a thread the other day that suggested using 303 Protectant on the sids of an RV to help protect against sun and UV damage to the fiberglass and decals. I live in Arisona and my MH sits on the west side of my house, so it gets some pretty good afternoon sun exposure. If using the 303, would it be applied before or after waxing?Thanks!

Most of my experience is with fiberglass boats in the marine environment, not RV's, but I have had the best results with the 303 on decals, and NuFinish polish on fiberglass. I usually use the 303 on the decals first, paying particular care to make sure all the decal edges get a good coat of 303. I then apply the NuFinish to the fiberglass, trying to avoid the edges of the decals the best I can. I have had some decals fail at the edges, and it might have been because some of the solvents in the wax, so I don't take chances anymore .....

There was a discussion on this forum awhile ago about the changes with 303 protectorent. I guess it is now made in China and that the previous chemical warnings are not there now so the formula may have changed.

I have been using 303 since 1993. I do not wax anymore.I haave found no reference to it being manufactured in China and the poster that stated it was could give me no reference to confirm his statement. My guess is he found a knock-off product using the same name.

I found this about 303 Aerospace Protectant

Harold1946,How do you apply it? Just spray it on and wipe it down?Ezgoin

303 Protectant and/ or wax | Good Sam Community

12 Replies

rgatijnet1
Explorer III
Jul 24, 2014
There was a discussion on this forum awhile ago about the changes with 303 protectorent. I guess it is now made in China and that the previous chemical warnings are not there now so the formula may have changed.
Bill___Kate
Explorer
Jul 24, 2014
Most of my experience is with fiberglass boats in the marine environment, not RV's, but I have had the best results with the 303 on decals, and NuFinish polish on fiberglass. I usually use the 303 on the decals first, paying particular care to make sure all the decal edges get a good coat of 303. I then apply the NuFinish to the fiberglass, trying to avoid the edges of the decals the best I can. I have had some decals fail at the edges, and it might have been because some of the solvents in the wax, so I don't take chances anymore .....

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303 Protectant and/ or wax

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