I'm having a primer adhesion problem on one door - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-07-2007, 11:00 PM
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I'm having a primer adhesion problem on one door

My passenger side repop door is giving me a bad time. The epoxy primer does not seem to be sticking to the door.
The door was stripped down to bare metal using a stripping disc. I roughed it up with sandpaper. I cleaned it, with alcohol. Compressed air etc etc

Areas of the primer would come off with my thumbnail.

I think it might be appearing as an adhesion problem , but might actually be a curing problem or catylizing problem with the epoxy primer.

Anyway I stripped the door a second time but the top edge of the door by the window, has the same problem again. Everywhere else seems to be fine.

Anyway, either the primer never kicked here. I mixed it improperly. It kicked too fast. It was too thick.

The thing I notice about the primer when it does this, is it does not feather out, if I sand it, It tears.

No other part of the car has had this problem. Same treatment everwhere else.

Any suggestions?


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Old 06-07-2007, 11:25 PM
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Was the catalyst new or old?

My guess would be an incorrect mix on the primer - or was the catalyst old or had it been opened and sat too long?
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Old 06-08-2007, 05:27 AM
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Ditto to the above.
If you stripped to the metal and cleaned it properly then
I don't think the door is the problem, it must be the product.
Strain your activator and see if it's clean, no seeds or clumps.
If it isn't clean and thin, get new activator.
Double check your mixing ratios.

Maybe you mixed something wrong without knowing it?
I once dumped a mixing cup of thinner into my clear thinking I
was adding more clear, you know, stuff happens when you
don't pay close attention.

Yours is going to be a hard one to explain with the other panels being ok,
That's why I'd double check my proceedures.
Sometimes we do things without knowing it, especially old
guys like me (LOL)
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Old 06-08-2007, 05:41 AM
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If the primer is soft you have a curing problem, if the primer cured up hard but adhesion is poor then the problem is not enough metal texture or it wasn't completely clean when the epoxy was applied. Any residue at all will compromise the adhesion to some degree. Epoxy needs a textured and clean surface, and good temps for a good cure. Also be carefull with the Klean-n-strip type discs because they do transfer some of the disc material (plastic I think) onto the surface of the metal and it isn't really visable. Manufacturer's of panel adhesives have warned about this over the years because they've seen adhesion failures when the discs were used to prep flanges for adhesive. I seen a roof skin come off a truck one time that was prepped with a klean-n-strip disc and glued with 3M panel adhesive, the disc left a film that the tech couldn't see when he applied the glue.
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Old 06-08-2007, 05:54 AM
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Off-topic, but safety-related...

They sell taller jackstands. The jackstand/cinder block combo looks like a good way to get killed. I know the wood between will spread the load, but it still seems unsafe.
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Old 06-08-2007, 06:09 AM
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go to a swap meet and get some old wide rims to set your car on. cinderblocks will exploid and crumble.
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Old 06-08-2007, 07:38 AM
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Those are concrete blocks, not cinder blocks.
(There is a difference)
But the same applies, that's really dangerous to
use them for supports. Please do something else,
They vary in strength a lot and can crumble in an instant.
Especially on their sides.
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Old 06-08-2007, 08:28 AM
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re-do!

dude,--re-do the jackstands do what the other guys say your looking for a bad headake i you keep it that way.......now for the paint re-sand the door,clean with lac.thinner,make sure you have all resadue off all metal edges and flat area's,then go and re-read the info.on the true mix of the primer,then
see if all is not(old)stuff, if too old (find out from your local paint guy),then re-buy some new and do it over again.,i know its a pain but you have a very cool car and you need to do it right.....................(bourne)
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Old 06-08-2007, 08:34 AM
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use wax and grease remover. laq thinner will only redistribute it. thinner drys way too fast and leaves residue on the panel.
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Old 06-08-2007, 11:48 AM
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What brand epoxy are you using?
Why did you strip the repop door?
What grit sandpaper did you use?
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Old 06-08-2007, 12:45 PM
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Like Shine said-Don't use laq thinner.
I learned that one the hard way (don't ask)
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