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Author: Subject: Epoxy Mastic Paint - Curing Time?
scootz

posted on 10/9/13 at 12:34 PM Reply With Quote
Epoxy Mastic Paint - Curing Time?

Does anyone know roughly how long you should expect epoxy mastic paint to set hard?

I finished the first coat about 6pm yesterday and it's still pretty soft now (20 hours later).





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jps

posted on 10/9/13 at 01:07 PM Reply With Quote
quote:
Originally posted by scootz
Does anyone know roughly how long you should expect epoxy mastic paint to set hard?

I finished the first coat about 6pm yesterday and it's still pretty soft now (20 hours later).


Out of interest - what's the temperature like where you've left it? (chassis I assume?)

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scootz

posted on 10/9/13 at 01:35 PM Reply With Quote
Unheated garage... maybe averaging 10 degrees in there from when I painted.





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davidimurray

posted on 10/9/13 at 01:36 PM Reply With Quote
Mine went hard within about 24 hours, but it didn't go proper hard (chip resistant) for about 3 months!!





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scootz

posted on 10/9/13 at 01:47 PM Reply With Quote
Ah! This is going to take me about a week to put on a few coats then!

TBH, I wasn't too fussed about it still being soft when I went out today as there are some areas that needed rubbing down before the next coat (it's the inside of a Quantum chassis, so it's flat panels and all on show).





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Benzine

posted on 10/9/13 at 01:49 PM Reply With Quote
Brushed/rollered or sprayed? I found with spraying lots of thin coats it's very fast to cure, but with brushing I ended up with thicker coats which took longer. Tacky within an hour usually, and I'd feel okay handling them after about 24 hours, that was in summer.
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scootz

posted on 10/9/13 at 01:50 PM Reply With Quote
Combination of brush for the corners and roller for the flats...





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scootz

posted on 11/9/13 at 09:01 AM Reply With Quote
Hmmmm... still soft. Can scratch through to the metal by running my fingernail (pretty lightly) across it!





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iank

posted on 11/9/13 at 09:11 AM Reply With Quote
Curing time (and conditions) should be on the datasheet (usually downloadable from the manufacturer).
Did it have a separate hardener to add?





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coozer

posted on 11/9/13 at 09:26 AM Reply With Quote
Data sheet on mine was 8 hours for touch dry and 7 days to fully cure.





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Peteff

posted on 11/9/13 at 11:23 AM Reply With Quote
Did it have any hardener with it ? I see iank asked the same, if it hasn't got a separate hardener 10° sounds a bit cool for paint, try running the hot air gun over it to start it curing.

[Edited on 11/9/13 by Peteff]





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scootz

posted on 11/9/13 at 02:58 PM Reply With Quote
Cheers fellas... it was a 1:1 mix with hardener (and about 5% thinner).





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scootz

posted on 17/9/13 at 03:35 PM Reply With Quote
Still able to score through to the metal with my fingernail.

I'm thinking I'm going to have to remove it, and then start again with an etch primer. It's going to take me forever to sand it all back...





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