Paint won't stick to finished fiberglass surface...need help

Discussion in 'Boat Yard Basics' started by Captain_Shane, Mar 9, 2010.

  1. Captain_Shane

    Captain_Shane Well-Known Member

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    I'am trying to paint a finished piece of fiberglass. The problem is that the paint will not adhere to finished surface. I tried to acetone to get the wax off and then roughed it up with sandpaper. Washed and repainted still will not adhere. What did I miss?
     
  2. Brett

    Brett > PRO STAFF <

    Just a guess that it's new fiberglass layup.
    The new fiberglass laminate is still outgassing.
    The vapors are a solvent, and eat paint.
     

  3. Captain_Shane

    Captain_Shane Well-Known Member

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    brett
    it is an old fiberglass platform.
     
  4. Brett

    Brett > PRO STAFF <

    Lemme think...
    old fiberglass with gelcoat surface
    I'd wet sand with 220 until no gloss left anywhere
    wash with dish soap
    rinse well then air dry for 2 days
    wipe with recommended solvent for primer to be used
    apply prime coat
    sand when dry
    wipe with recommended solvent for finish coat
    apply finish coat

    or... sand, clean, apply a coat of epoxy, wait a week,
    sand, clean, paint with Interdeck non-skid paint.
    Interdeck requires no primer over a new epoxy finish.
     
  5. paint it black

    paint it black Paddling away...

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    What grit did you sand with?

    Most boat paints require 120-220 grit surface.
    I'd go with 120 or 150.
    Also, what kind of paint are you using?
    When using non-catalyzed paints such as Brightside and Easypoxy, the paint tends to not adhere if put on too thick.
     
  6. Captain_Shane

    Captain_Shane Well-Known Member

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    Got it fixed. Thanks fellas!
     
  7. snooknreds2

    snooknreds2 Well-Known Member

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    well Shane, what did you end up doing to get it to stick?
    By the way, it is good to see you around! It has been a long time, hope all has been well with you!
    J
     
  8. Captain_Shane

    Captain_Shane Well-Known Member

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    Waz up Jason!
    I do not know but here is what I did to fix it.
    1. Wiped multiple times with acetone and clean rags.
    2. Washed with heavy duty degreaser soap and a brillo pad.
    3. Sprayed a base coat with a different (cheap) paint.
    4. Finished with my primary top coat (which adhered fine to the underside surface which was rough (chop glass)

    I think it was the the wax coming out of the gelcoat that was causing my problem.
     
  9. mark_gardner

    mark_gardner I Love microskiff.com!

    ok well how about some pictures then? :) or was this that killer looking poling platform you were working on? :cool:
     
  10. Brett

    Brett > PRO STAFF <

    I can see where that would cause some serious stress.
    If the platform was built in a mold, that wax would be a very thin layer on the surface.
    But if the gelcoat finish was applied after the fiberglass was laid up, and removed from the mold,
    then the Modifier "C" (a wax additive) would still be present throughout the gelcoat.
     
  11. Captain_Shane

    Captain_Shane Well-Known Member

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    Brett i think you nailed it on the wax additive. Iwas woking on this poling deck i got from Pugar. It was an older used model but came out perfect!
    [​IMG][/img]
     
  12. DuckNut

    DuckNut Brandon, FL

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    One other thing that will cause this is when you "wipe" it down. You have to wet the rag and swipe it across the item, if you simply rub it such as removing car wax you are just moving the wax around and not removing it. Wet the rag and swipe, turn the rag every time to use both sides and then get a new rag.

    Paper towels without print on them is good.
     
  13. paint it black

    paint it black Paddling away...

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    I like blue shop towels.
    I also always come back with a dry shop towel to remove any residue after wetting it out multiple times.