putting on primerSubscribe
  1. Member Since
    Jan 2015
    Posts
    13
    3 Weeks Ago - Jul 2, 2016, 9:46 AM - putting on primer #1

    It's probably a noob problem and question but I started building a jetpack from sintra & cardboard. I've filled the gaps with Motip Fine Putty and after sanding it all, I put a spraycan primer on top of it. And here comes my problem( if it is one?):
    When spraying the primer on the cardboard, the cardboard takes in a lot of primer and the surface is kind of "hairy". Is this normal or how do you solve this?
    wp_20160702_16_27_11_pro-jpg

    Mutley Out
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  3. Delta13Mike's Avatar
    Member Since
    Feb 2014
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    128
    3 Weeks Ago - Jul 2, 2016, 10:10 AM - Re: putting on primer #2

    Welll it is cardboard after all. If it is the kind with no top layer then it will act like any paper in contact with fluid. You may try to sand it a little but I'm not sure if it will help.

    Mike
  4. Gregory's Avatar
    Member Since
    Oct 2015
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    318
    3 Weeks Ago - Jul 2, 2016, 1:05 PM - Re: putting on primer #3

    In this case the primer is acting like a sealer, as it would with wood. You can lightly sand it and do a second, perhaps third coat of primer. Eventually it will stop being hairy.
  5. superjedi's Avatar
    Member Since
    Jul 2003
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    5,024
    3 Weeks Ago - Jul 2, 2016, 6:32 PM - Re: putting on primer #4

    Yeah, painting unsealed cardboard or paper is tricky. I would recommend letting it dry thoroughly, then sand it down well before going any further. You can try sealing it with some kind of PVA glue or a similar product. PVA glues are ones like Elmer's or Mod Podge. Mod Podge is what people use to seal jigsaw puzzles. You can get it (or something like it) pretty cheap at places like Michael's or Hobby Lobby. I'd try brushing on a couple of light coats of that with some of those disposable foam brushes. Don't lay it on too thick or it can run or drip, and that will mean more sanding.

    But if you keep going without sealer, it's going to take an awful lot of primer to get things smooth. Good luck!
  6. Member Since
    Jan 2015
    Posts
    13
    2 Weeks Ago - Jul 7, 2016, 1:31 PM - Re: putting on primer #5

    Sanding and spraying on primer again multiple times do the trick ;-)

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