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Thread: Bad Polycrylic Finish

  1. #1

    Bad Polycrylic Finish

    I sprayed a project (rocking tractor) with polycrylic gloss over spray paint. It was pretty hot that day and I also must have sprayed too thick. Short story...the finish cracked and flaked on parts that are very hard to get to. Has anyone used denatured alcohol to "melt" the finish and rub it smooth? I'm really trying not to completely sand and refinish. An help or suggestions would be greatly appreciated.

    HELP!!!

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    Last edited by James Schroedter; 08-28-2020 at 2:16 PM.

  2. #2
    Join Date
    Mar 2003
    Location
    SE PA - Central Bucks County
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    65,796
    Alcohol isn't the solvent for most waterborne finishes...including Minwax Polycrylic. You'll likely need to strip and refinish. If you do, keep in mind that the spray paint you use must be FULLY cured before you put that top coat on there and you'll also need to lightly abrade it for proper adhesion. Fully cured for typical spray paints can take weeks, so don't be in a hurry. If time is of the essence, opt for a waterborne finish that can be tinted to the color you want.
    --

    The most expensive tool is the one you buy "cheaply" and often...

  3. #3
    Finish was properly cured (app. 2-3 weeks in S Texas) and was sanded lightly before polycrylic was applied.

  4. #4
    Join Date
    Feb 2019
    Location
    Grafton NY
    Posts
    277
    I started a couple of years ago, applying a coat of shellac over paint. Before applying any other finish.. so far so good
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  5. #5
    Join Date
    Mar 2003
    Location
    SE PA - Central Bucks County
    Posts
    65,796
    Ok...that looks like a machine. Why the Polycrylic? That said, too heavy and hot could have caused the surface to cure quickly while under it remained soft. A barrier coat of was free shellac like Clark mentions may be a good idea in case there's some kind of incompatibility between the spray paint and the Polycrylic. A clear of the same brand/type as the paint is an alternative solution.
    --

    The most expensive tool is the one you buy "cheaply" and often...

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