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Im not sure there's a specific timescale.

If its emulsion you could lightly sand the existing, and always apply a third coat if the first coat showed through.

Its probably more a question of how long the paint can / should be kept in the tin, personally i wouldn't leave it more than a few weeks in a tightly sealed container but the pro's on here will be able to advise more definitively.

Blup
 
Oil-based gloss will be a problem - a second coat of oil-based gloss needs doing fairly quickly, if not you risk it peeling off in time.

Personally I wouldn't leave it more than a week, but that's partly because I don't know the actual answer.
 
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As per Sparkwright's post. I you leave it for a couple of weeks I would recommend giving it a light sand with 180 grit silicon carbide paper to provide a key to aid adhesion.
 
Sorry thespecialone, I omitted to add that if the paint is still quite soft, drop down to 240 or 320 grit- you don't want to rip the surface.

Oil based finishes take months to fully cure, where as waterbased paints takes weeks to cure.

When painting exterior wood work I routinely apply two coats of gloss without sanding in between but I try to make sure that the second coat is applied within a week of the first gloss.

Please note that I recommended silicone carbide paper, it is very different to aluminium oxide paper. SC paper is typically thinner/more flexible than AO paper and is normally stearate coated which helps to reduce clogging. 180 or 240 AO paper will be more likely to rip a two week old surface.

Best of luck.
 
Hi opps thanks for your response the paint is oil based,and it will be almost two week by the time i get the next coat on. The finish is satin will i still need to use 240 grit?
 
Two weeks should be fine without needing to sand the older coat of satin. If it were gloss I would recommend sanding.
 

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