I repainted my bumper last Tuesday and i can still dig my nail into it and peel it and the base coat off (primer still has good adhesion)
This was my first time ever spraying with an HVLP gun, it was sprayed in 70-75 degree heat with around 35% humidty.
BC instructions recommended 15 mins between the final coat and clear coat i gave about 20
CC Instructions recommended 2-wet coats with 5 mins between, i sprayed 4 although i got a distracted talking to someone and ended up giving only around 1 minute between the 3rd and 4th coat
the humidity since Wednesday has been over 70% and its been around the 75-85 temp range
So did i not add enough hardener? too much humidity? not enough time between coats or a combo of all 3?
Products used:
Finish1 2K Primer 4:1 ratio
Finish1 2K Clear 4:1 ratio
ATU acrylic-lacquer basecoat (pre-mixed)
Clear Coat- Not Enough Hardener?
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Non-Lurker
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Joined: Mon Jul 16, 2018 2:28 pm Location: New Hampshire Country: USA |
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You probably didn't use enough activator.
Humidity will actually speed up the activation process. I paint when it's raining all the time, I prefer to because I get cleaner results. It always sets up just fine. Humidity is not a problem with urethanes like it was with the lacquers that we use to use. JC.
(It's not custom painting-it's custom sanding) |
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Non-Lurker
Posts: 3
Joined: Mon Jul 16, 2018 2:28 pm Location: New Hampshire Country: USA |
Heh thats what i was afraid of, knew something had to go wrong since i managed to get no runs or spray-related issues on my first ever try with an hvlp gun Would i be able to sand down the clear with 320/400/600 grit paper and re-clear or would i need to bring it back down to primer? |
If it's hard enough to sand easily, then it should be hard enough to
sand lightly and reclear. But for just a bumper I'd opt to sand most of the clear off, rebase and reclear to be safe. And add a little activator to your base too. (about 1oz per qt of mixed base) that will help adhesion. JC.
(It's not custom painting-it's custom sanding) |
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Non-Lurker
Posts: 3
Joined: Mon Jul 16, 2018 2:28 pm Location: New Hampshire Country: USA |
Appreciate the help, im gonna try just sanding it light and re-clearing as the truck is on daily-driver duty and i cant afford to have it down for more than a day. |
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