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Paint/Primer Help
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Kevin View Drop Down
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Joined: 11 Sep 2009
Points: 58 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Kevin Quote  Post ReplyReply Direct Link To This Post Topic: Paint/Primer Help
    Posted: 08 Mar 2011 at 11:02am

I'm needing some painting advice. I'm redoing a d-17 using Electrolysis for stripping it down. I'm having an adhesion problem with the primer.. I shot it with the shopline epoxy primer(white) back in the summer, I waited the proper time for the primer to set before spraying.. put down 2 coats, I then painted those parts within the 72 hour window with shopline paint.. I prepped the metal/cast with wax and grease remover just to be sure it was clean.. The end product looks awesome so I thought.

 I was moving the painted parts around on the bench and bumped them together and the paint just popped off all the way to bare metal.. I then started checking all the other pieces and sure enough they chipped to bare metal also..Paint to primer adhesion is good, Im just stumped as to what is going on.. I'm going  to strip everything back down to bare metal again and start over..UGGGH!!!! What do I need to do different this time??
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Butch(OH) View Drop Down
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Joined: 11 Sep 2009
Location: Lucerne Ohio
Points: 3835 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Butch(OH) Quote  Post ReplyReply Direct Link To This Post Posted: 08 Mar 2011 at 11:16am

Assuming that you did indeed have the surfaces clean  your problem is the surfaces need to be roughed up so the Epoxy primer can "tooth in" to the bare metal. There are two ways to acomplish this. One is to sand the bare metal before you prime with the proper grade of paper which is listed on the primer "p" sheets. The other is to use a self etching primer under the epoxy.  My prefferance is to sand, others like the self etching primers and use them for everything. The reason for the self etching primers existance is so production shops can skip the sanding step and squirt paint on new or chemicaly stripped metal. The etching primers WILL make a believer out of you for air supplied respirator.
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DonDittmar View Drop Down
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Joined: 15 Sep 2009
Location: MIllersburg, MI
Points: 2485 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DonDittmar Quote  Post ReplyReply Direct Link To This Post Posted: 08 Mar 2011 at 3:18pm
Had the same problem when I redid my D14. Everything I paint gets a coat of etch beofre primer
Experience is a fancy name for past mistakes. "Great moments are born from great opportunity"

1968 D15D,1962 D19D
Also 1965 Cub Loboy and 1958 JD 720 Diesel Pony Start
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