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Old 08-15-2005, 12:56 PM
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PPG Epoxy Primer Question

Hello fellow 'rodders.

I am in need of some clarification on the cure/re-coat time of PPG's DPLF epoxy primer.
If I apply a surfacer over the epoxy primer within the 7 day window, am I correct in believing that the epoxy does not need to be scuffed?
Is it better to scuff it even if it is within the 7 day window just to be on the safe side?

Thanks for your continued help.

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Old 08-15-2005, 01:41 PM
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Yes, you can topcoat DPLF within 7 days of applying it.

I guess it never hurts to scuff/knock the nibbs off but you really dont need to.

What are you sealing with? I use DPLF as my sealer for everything.

Rich
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Old 08-15-2005, 01:50 PM
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Thanks,

I am sealing with the K36 sealer and then base/clear. I did this with the cab and doors of the 53 Ford and it worked out great but it took several months of prep. So when I was ready i just scuffed up the epoxy and moved on. Now I have some small front end parts that need to get done that should be able to be topcoated within a week.
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Old 08-15-2005, 01:58 PM
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Well you should have it made in the shade then.

I always dry guide coat DP and wetsand with 600 when I am using it as a sealer. Its perfect when I start spraying. But as long as it was in the window, I really wouldnt have to.


Rich
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Old 08-15-2005, 03:09 PM
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even if it says 7 days i would scuff after 24 hours on any epoxy. if you can, spray the epoxy then wait an hour or two then some primer on top of that. this way the primer bites into the epoxy while its fresh. just my opinion. i've had too many problems with base peeling off epoxy when laying out graphics and stuff. on an overall you would never really know. is it absolutely necessary....probably not for what you are doing but the sooner you get it on the better the adhesion will be.

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Old 08-15-2005, 04:08 PM
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Quote:
Originally Posted by mrcleanr6
even if it says 7 days i would scuff after 24 hours on any epoxy. if you can, spray the epoxy then wait an hour or two then some primer on top of that. this way the primer bites into the epoxy while its fresh. just my opinion. i've had too many problems with base peeling off epoxy when laying out graphics and stuff. on an overall you would never really know. is it absolutely necessary....probably not for what you are doing but the sooner you get it on the better the adhesion will be.
&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

What Jim says is true when doing multi colors and a lot of taping.
Base does not have maximum adhesion to epoxy until the end of the open coat.

What you will find with fresh epoxy is the first day or two you can peel the base off, 3rd day it might be weak in spot or two and after the fourth day usually you cannot scrape off.

Under normal painting conditions, there would be no benefit to sand the epoxy.
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