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Top coat

Discussion in 'Decorating and Painting' started by thespecialone, 23 Aug 2019.

  1. thespecialone

    thespecialone

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    What is the longest i can leave top coat before applying the second coat thanks in advance
     
  2. blup

    blup

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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
     
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  3. sparkwright

    sparkwright

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    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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  4. thespecialone

    thespecialone

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    the paint being used is dulux ultimate opaque satin
     
  5. opps

    opps

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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.
     
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  6. opps

    opps

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    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.
     
  7. thespecialone

    thespecialone

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    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?
     
  8. opps

    opps

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    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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