Is it worth the hassle 2pack paint topside

Kelpie said:
I've got a full face respirator, which filters would be best for isocyanates? The 3M website wasn't very helpful, they just said that when spraying you should use an air supply, and if brushing you shouldn't need anything.
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A2/P2 spec filters should be what you need. A2 referring to 'vapour'. Still good to filter out the solvents, even if isocyanates themselves aren't present. I've kept two respirators handy on board during our refit. One with P3 (dust) filters and another with A2 (vapour). I sling the A2 mask on even if I'm just working with something like acetone in confined spaces.
 
dankilb said:
A2/P2 spec filters should be what you need. A2 referring to 'vapour'. Still good to filter out the solvents, even if isocyanates themselves aren't present. I've kept two respirators handy on board during our refit. One with P3 (dust) filters and another with A2 (vapour). I sling the A2 mask on even if I'm just working with something like acetone in confined spaces.
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just looked i got A1 and p3 filters on my full face mask
 
Another question about 2 pack paint: is it acceptable to use it to fill very minor gaps (talking about hairline cracks and pinholes).
I'm building a dinghy from plywood and every time I think I've epoxied the last tiny gap somewhere, another one catches my eye. At some point over got to put the epoxy away and open the tin of paint, but I'm just wondering about the delays it would cause if I was half way through painting and found one more pinhole.

I know that conventional paint does not work like this, because it cures through solvent evaporation so cannot cure properly in a reasonable time unless applied in a thin layer; I also know that it is too prone to shrinkage to effectively fill any gaps.

Seeing as 2 pack cures through a chemical reaction, my thinking is that it doesn't really matter how thick you put it on, it should still cure, and perhaps not shrink so much?
 
Kelpie said:
Another question about 2 pack paint: is it acceptable to use it to fill very minor gaps (talking about hairline cracks and pinholes).
I'm building a dinghy from plywood and every time I think I've epoxied the last tiny gap somewhere, another one catches my eye. At some point over got to put the epoxy away and open the tin of paint, but I'm just wondering about the delays it would cause if I was half way through painting and found one more pinhole.

I know that conventional paint does not work like this, because it cures through solvent evaporation so cannot cure properly in a reasonable time unless applied in a thin layer; I also know that it is too prone to shrinkage to effectively fill any gaps.

Seeing as 2 pack cures through a chemical reaction, my thinking is that it doesn't really matter how thick you put it on, it should still cure, and perhaps not shrink so much?
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There is a two pack primer whose purpose is to fill small hairline cracks. If the defects are bigger, then there are various fillers. I highly recommend using a couple of coats of primer and then sanding it to the best possible finish you can get. Then two coats of top coat, sanding flat with 200 wet and dry, and then a final top coat which you then sand with 400, 600 and then polish to a absolutely flat mirror finish.

Otherwise, just slap on a single coat of non two pack Toplac. That is what I have on my pilot cutter. Looks good too, but is not a perfect mirror finish.
 
Rhylsailer99 said:
I've got the top half of my boat now down to original gel coat and all keyed ready for painting. I'm worried about using a 2 pack paint as I have little experience of painting . How long would a single pack paint last before it needs repainting and any reccomendations.
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I sprayed the topsides 2 pack of white polyurethane and didn't regret it...A wooden dingy made a blue scratch on the port side about 50cm long and was ready to cry out loud because it was just freshly painted, around a month later. I started cleaning the blue scratch with baby towels until it disappeared completely. The blue was the alkyd paint of the wooden dingy that just remained on the 2 pack but didn't remove. If you can spray a 2 pack it's the best option...You can get away and roll your deck without looking bad, especially if most areas are antiskid, the minority of areas can be rolled instead of sprayed.
 
Rhylsailer99 said:
you got me paranoid so i bought 2 A2 filters also from arco yesterday.
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I've just finished my first section with the 2 pack. My new filters haven't arrived yet and being a bit impatient I cracked on with the ones already on the mask. Didn't think they were doing anything as I could still smell the paint.
When I finished, I took the mask off and the smell nearly knocked me off my feet. I don't know how harmful it would be but it's certainly not pleasant.
 
Hassle of 2 pack.. my experience,what hassle? I painted in jan/Feb in less than 10c and it wasn't that different to painting single pack.
Dries fairly quick so no danger of the evenings damp getting to it.
 
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