Gel Coat Prep for Interlux Brightside - Fiberglass RV
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Old 09-02-2020, 10:22 AM   #1
Junior Member
Name: Jeff
Trailer: Hunter Compact Jr
Posts: 2
Gel Coat Prep for Interlux Brightside


Iíve got a 1973 Hunter compact jr that I am renovating. This is my first ever trailer and when I bought it I thought it just needed a paint job and some cosmetic enhancements. Turns out I gutted the whole thing and started from the beginning. Iím okay at some basic woodworking but everything else Iím YouTube and reading these forums.

Previous owner painted with some bad house paint. I removed all of the old paint and I am now at the original gel coat (yellow). There is already some bondo fixes from previous owner and a few larger fiberglass cracks that need fixing. Because of this I am going to prep and repaint the trailer with Interlux brightside.

My question:

The gel coat is already pretty thin in a lot of areas. The gel coat also has a lot of knicks and gouges from paint scraping. I wanting advice on how to sand the gel coat in preparation for interlux pre-kote primer. A couple auto body shops told me to sand with 320- grit and then prime. I called interlux and they told me to sand with 120 grit and then prime, as their primer isnít likely to stick to 320- grit. Iíve read various opinions on this forum and it seems like 320-400 grit seems to be popular.

Because my gel coat is thin, I feel like Iíve got one chance and donít want to screw up Should I go with 120 like interlux rep told me? Should I hand sand or use my random orbital sander? Any advice would be greatly appreciated!

Pics are attached, I think.

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Old 09-02-2020, 10:34 AM   #2
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Name: Steve
Trailer: Scamp 13
Posts: 1,890
go to the manufactures website and get the data sheets for all the products you plan to use. then when you absorbed that call the manufacturer tech line.

I assume your planning to roll and tip method. lots of you tube stuff for that.

prime all of it so you get the even same texture in your top coats.
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Old 09-03-2020, 10:16 AM   #3
Junior Member
Name: Steve
Trailer: Casita
Posts: 4
Gelcoat repairs

Theres a Youtube channel, ďboatworks todayĒ where the guy does a lot of informative gelcoat/fiberglass repair. He also does different topcoats.
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Old 09-05-2020, 07:53 AM   #4
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Name: Tim
Trailer: In the ma
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Old 09-05-2020, 07:54 AM   #5
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Name: Tim
Trailer: In the ma
Posts: 64
I went per their directions and I was pleased with the results
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