Flowcoat for refurbishing fibreglass

To get it to stick permanently, you will have to sand and clean very thoroughly, essentially taking the surface off the old resin, as well as removing any paint.
This may mean you are sanding through a fair amount of glass, if it is heavy cloth?
I've used flowcoat more successfully on repairs where I've put new glass layers in.
You may get away with scrubbing with something like Vim, rinsing, drying and washing with acetone?
 
Yes. Flowcoat is the top coat for fibreglass. The layup goes off sticky, and the flowcoat (also called sanding coat) smooths out the layup and is not sticky, allowing you to sand it and polish it. I've used flowcoat mainly in the building of surfboards, and I can't really recommend it for sprucing up the glassfibre in the cabin.

I would avoid it for two reasons - it's very smelly - and I'm not sure how you would get the fumes out of your boat as they are heavier than air, and it really needs that sticky fibreglass layup to bond well. I considered it for my cabin, but in the end went for normal topside enamel single pack gloss paint. This worked really well - it smoothed off all the rough edges, looked really good and has lasted really well. Also it just needed a quick sand with paper or a wire brush to prepare the surface. One coat of paint and it all looked instantly better.
 
I used white flowcoat very successfully as you intend to use it. Preparation is important, as is consitency when you apply it - not to runny and only mix quantities you can work with. It is smelly but of course the smell clears.
 
I replaced the foam backed headlining in the cabin last year.

The shrouds attach fore and aft of a shaped wooden former bonded to and at right angles to the hull. It is an arrangement I like to be able to inspect easily and rather than cover the the wood as it was before I simply coated it with a couple of coats of flowcoat. I had probably abraded the surface with a wire cup on an angle grinder as I had the rest of the inside of the fibreglass to remove most of the old glue and may have treated the are to a wipe with either acetone or Hawke House "Tradesolve". It was a small area, I was using forced ventilation in the form of a simple desktop fan and my boat is small with companion way hatch open and foreward espcape hatch opened. I probably used an appropriate vapour designated face mask.

Dont remember the fumes being a problem.
 
I can vouch for the durability of Flowcoat. All the hidden internals on our boat ( a Finngulf) are generously coated with it, the inside of cockpit and under berth lockers, the underside of moulded grp lids , removable plywood locker lids under berths , the bilges, the engine bay, the underside of floorboards etc etc. Most of it is bright white though below floor level and around the keel well they used brown. It resists chipping and scratching, is easy to scrub and gives a a clean bright smooth look to gloomy cavities. Having a clean smooth white surface below and around the engine contains any accidental spills and encourages cleanliness.
The boat is now eight years old and the surfaces are unmarked.
 
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