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Old 10-08-2008
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AwlGrip: Need to sand between topcoats?

Hello all,
I'm in the process of painting my fiberglass deck with AwlGrip before laying Treadmaster non-skid. I have already gone through the painstaking prep process (I never thought it would end!) and laid the 545 primer and 1st topcoat of AwlGrip. However, I can't seem to find mention anywhere of whether or not to sand between topcoats. AwlGrip's website says to sand b/t primer and topcoat but nothing after that.

Should I lightly sand with 220-400 sandpaper or will the 2nd coat bond appropriately to the paint I have already applied?

Jesse
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Old 10-08-2008
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If you are using the roll and tip method then yes, you need to sand between topcoats. Also, you really should have two coats of primer.

Wait at least 16 hours between coats. Also, throw the recommendation for solvent out the window - thin it as much as you need to to get the right flow. Under some conditions, that will exceed the recommended max of 1/3.
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Old 10-08-2008
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actually depends on the time between coats but always trust a mechanical bond than rely on a chemical bond.
good thread here. The AWLGRIP Knowledge challenge - Boat Design Forums
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Old 10-08-2008
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click on the "the" friggin hyperlinks.
The AWLGRIP Knowledge challenge - Boat Design Forums
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Quote:
Originally Posted by NOLAsailing View Post
If you are using the roll and tip method then yes, you need to sand between topcoats. Also, you really should have two coats of primer.

Wait at least 16 hours between coats. Also, throw the recommendation for solvent out the window - thin it as much as you need to to get the right flow. Under some conditions, that will exceed the recommended max of 1/3.
I'll second what you said about thinning for roll and tip. I didn't figure it out until I dropped the brush and used thinner to clean it off. When I started tipping again the finish was like glass! I then thinned and thinned until I could reproduce that result. It took a LOT more thinner than I could ever have imagined!
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