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-   -   HOK kpc2f epoxy primer.. not adhering well? (http://www.hotrodders.com/forum/hok-kpc2f-epoxy-primer-not-adhering-well-61284.html)

beemdubya 04-13-2005 04:36 PM

HOK kpc2f epoxy primer.. not adhering well?
 
So i stripped a door on a car im working on using 36grit and then 80grit paper. Then i cleaned the surface with wax and grease remover and then i used metal conitioner scrubbed it with a red scotch brite pad and let it sit on there for 10 minutes keeping it wet at all times. then i washed it off with water and cleaned it again with wax and grease remover. sprayed my two medium coats of the epoxy on there. well today i was sanding the qaurter panel and accidently hit the door.. the primer chipped and little and got me thinking if this was actually adhering properly.. so i take some 80g in my hand and sand the chip a little bit.. and sure enough it just started coming off and it wouldnt feather edge. so i grab my palm sander with 180 on it and sand it.. some spots feathered some just chipped. out of the 16inches that is sanded i would say 4 inches actually feathered but if i sanded it long enough it would just chip again. i did a test panel about 20 minutes ago.. i did just bare metal with no conditioner and then i put SEM self etch under the other.. if this doesnt work and noone knows what the problem is im gonna throw it away. since it is not what i usually use in the first place it was brought to me by the owner. has anyone used this before?

BarryK 04-13-2005 05:36 PM

You are probably in good shape!

Epoxy does not give maximum bite right away, the first 24 hours if you take a scraper you can probably scrape it off pretty easy after 48 hours you may chip a few spots after a couple of days as the epoxy cures is when you start getting adhesion to the point that it won't scrape off or not feather.

Now also keep in mine that cold metal will slow the above process down.
The above days I'm speaking of would be 70 Degrees or higher.

beemdubya 04-13-2005 06:21 PM

it has been about a week since i primed the door.. i have a couple other parts that i primed about a month or so ago with the same stuff im gonna see how they are doing tomorrow. the temperature has gone down at night but the days have been 70degrees give or take some. if i just skip the metal conditioner will that work... or if i skip the metal conditioner and just give one light coat of the self etch will that work?

BarryK 04-13-2005 06:32 PM

Well, if its been a month, than that is a problem. and only two things I can think of to cause that is,
Not activated properly or the metal treatment not neutralized properly.

If its working on some panels and not others than most likely would be an acid problem.
I would from here on out skip the acid treatment.

baddbob 04-13-2005 10:54 PM

I quit doing acid many years ago :drunk: Metal prep type acid treatments caused me a lot of grief. A clean and textured surface is all the epoxy should need for good adhesion IMO. When you're done cleaning the metal surface you should be able to wipe a clean white towel with no discoloration showing on the towel.

Bee4Me 04-14-2005 07:09 AM

That may be the one that goes dormant below 70.
The non catylized can be stored in the fridge indeffinetly.
I agree with not using the acid treatment as it can cause you alot of grief.
IF the temp was consistantly below 70,That is most of the problem.
It just quits curing.

beemdubya 04-14-2005 08:24 PM

Well, my test panel helped me out alot.. the part that had nothing under the epoxy stuck perfect.. what i did was take a razor blade and try and chip it off and get under it.. well needless to say it didnt chip at all on the part of the panel with no etch at all. just kinda scraped the top layer off. i guess this primer isnt so bad afterall. but ill stick to the epoxy i normally use.


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