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Yeah you need to topcoat if doing the roof but not the floor really because floor not going to be exposed to uv (well depends on how big hutch is, suppose if open sided court rather than hutch it will). Topcoats not just your colour aesthetic it provides uv protection to your laminate underneath. Otherwise your laminate will eventually perish as no uv stabilisers in polyester resin. But topcoating doesn’t provide any waterproofing. People with Grp roofs who have a leak and pin holing think it’s the top coat, it’s the original laminating/paddle rolling in your laminate, air entrapment/ dry glass etc. I’ve done my ferret hutch floor, top coated it just because really and the gear was free. Something to bear in mind down the line you can’t topcoat over topcoat doesn’t adhere to itself. So if you want to tart it up in the future if colour fade or applied too thinly in spots flaking you can’t just give it another coat. Need to sand right back and acetone then re-topcoat. 

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I glassed my hutch, 14 years ago, I never top coated and it still looks like the day I finished it.

 

think you guys may be confusing top coat and gel coat, two totally different things, seriously no need to gel it out, if you want to protect the fibreglass then get a flo-coat paint.

if you want to gel it don’t forget some is waxed and some is not depending on your use.

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On 13/01/2021 at 19:32, gnipper said:

I'm in the middle of building a new ferret hutch at the minute and I'm going to fibreglass the floors inside and probably the roof too, is there any real need for the top coat or will it be ok without it? 

 Cheers 

You can give it a coat of resin after the glass application has hardened, it will help the matting to resist fibres being nail scrapped up and assist a little towards moisture resistant.

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