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  1. #1

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    Mold release removal

    I used alcohol to clean the mold release from a fiberglass cowl. After a fairly short time the paint (PPG) seems to be be popping off way too easily. I wondered if all of the mold release came off when I cleaned it. Should I have used something else like acetone or water? Yes, the surface was primed with PPG primer before painting. Thanks in advance.

  2. #2
    ByLoudDesign's Avatar
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    RE: Mold release removal

    Most mold releases are soap and water clean up items. That is how we cleaned up the 17-9' boat hulls when we pulled them from the molds, it was PVA.
    Kits: F11C-2 1:4, Do-24T 1:8, P-3 1:10, Howard 500 1:5, XFY-1 1:4, SR-9 1:4, V-22 1:6, B-25J 1:4, F+W C3603 1:5, B314 1:11, DHC-4 1:10

  3. #3

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    RE: Mold release removal

    soap and water
    Drinking and driving are illegal, why do bars have parking lots
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  4. #4
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    RE: Mold release removal

    Soap and water but a dose of 91% alcohol won't hurt either. I would NOT use MEK, Toluene, lacquer thinner, or acetone.
    Let\'\'s launch, first one up takes lead and we\'\'ll brief on Guard!
    Owner, F&M Enterprises

  5. #5
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    RE: Mold release removal


    ORIGINAL: BullardRM

    I used alcohol to clean the mold release from a fiberglass cowl. After a fairly short time the paint (PPG) seems to be be popping off way too easily. I wondered if all of the mold release came off when I cleaned it. Should I have used something else like acetone or water? Yes, the surface was primed with PPG primer before painting. Thanks in advance.
    I will usually use a Scotch Brite pad and dish soap/water. You didn't say if you sanded the clean surface to break the gloss or not or if it were epoxy glass or polyester.

    Of course it's true, I read it on the Internet.

  6. #6
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    RE: Mold release removal

    same ? as above,, speed is speedy
    You're so smart,, you figured out how to read this!! Or maybe ya just got lucky??

  7. #7
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    RE: Mold release removal

    You usually want to keep the gloss and sanding or scotchbrite will dull it. Just soap and water should be sufficient. Don't over think it.
    Let\'\'s launch, first one up takes lead and we\'\'ll brief on Guard!
    Owner, F&M Enterprises

  8. #8
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    RE: Mold release removal



    Soap and water work's best for me. While I'm at it I use 400 grit to wet sand. If there's a gloss left it's too smooth for paint to adhere to. All manufacturer's recommend sanding before painting over any type of resin.

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  9. #9
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    RE: Mold release removal


    ORIGINAL: Chip_Mull

    You usually want to keep the gloss and sanding or scotchbrite will dull it. Just soap and water should be sufficient. Don't over think it.

    When painting you need a correctly preped surface. The bond between the paint and fiberglass is a mechanical bond which requires scuffing.

    Of course it's true, I read it on the Internet.

  10. #10
    scale only 4 me's Avatar
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    RE: Mold release removal

    I always sand too, ya gotta knock the shine off in my book
    You're so smart,, you figured out how to read this!! Or maybe ya just got lucky??

  11. #11
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    RE: Mold release removal

    When you know you are going to paint a molded part stop your sanding it at 180 grit. I gives you somewhat of a paint holding surface for the upper coat. It can not be to rough or your have trouble pulling the part. If you can use a gel coat of the color wanted in the end, then you can go for the perfect shine on the plug. I have spent days in a 19' female runabout mold getting a shine on it.
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  12. #12

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    RE: Mold release removal

    Water.
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  13. #13
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    RE: Mold release removal

    You use water to clean the part.
    You must sand a new fiberglass part, 220 grit is best to ruff up the surface.
    You must also use theproper primer.
    If you can scratch the primer off with your fingernail it is not the right one for fiberglass.
    A clean scuffed surface and the correct primer are essential for a successful paint job.
    Epoxy Glass Fuselages, Short Kits & Fiberglass parts. Proudly made in the U.S.A. rcaiir.com
    email: rcaiir@gmail.com

  14. #14

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    RE: Mold release removal

    Always clean off mold release with soap and water FIRST. Never sand or scuff up the fiberglass until it's been cleaned. Otherwise, you can scrub the PVA down into the glass and cause adhesion problems.
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