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  #11  
Old 11-01-2013, 07:27 AM
broken1234 broken1234 is offline
 
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The DCX series hardeners are used in some clears and DCC single stage basecoat. I wasn't aware that it was an option in K36 either. But I don't use K36 as a wet/wet sealer either. For what you want to do, I'm sure the the PPG tech folks would suggest the K201 hardener.

Dan is completely correct about the other stuff, by the way... DP is the only epoxy product... and anything with a solvent is going to shrink...

Back in the 90's when I started painting composite airplanes, I sent PPG some scraps cut off of a wrecked Lancair 320 to play with. Their suggestion, for best adherion was to apply a coat of DP__ first, then use K36 or K38. But they noted that the DP was optional and the K__ should adhere fine as the first product applied also..

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  #12  
Old 11-01-2013, 07:43 AM
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Brad, I am glad to see your reply re: applying K36 by itself vs over DPLF. I was wondering why it was necessary (or desirable?) to spray DPLF first and then K36. Since I am using this over gel coat (cleaned and scuffed), is it best to apply DPLF first? Or does it matter?
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  #13  
Old 11-01-2013, 09:20 AM
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Quote:
Their suggestion, for best adhesion was to apply a coat of DP__ first, then use K36 or K38. But they noted that the DP was optional and the K__ should adhere fine as the first product applied also..
Ahh, nice, thanks Brad. That's almost exactly word for word what the PPG field rep told me when I went PPG circa '06. I asked because a previous, late 80's composite project had peeled at the interface between the well-sanded glass surface and a then-popular polyester high-build surfacer. I've been cautious ever since.

Anyway, the word was that you don't need DPLF under the K36, but for maximum adhesion spray DPLF, then spray K36 as soon as the solvent flashed.

There's a nice little side benefit. Use a different shade of DPLF under the K36 and it becomes a sanding guide. Stop blocking the K36 when you can see the DPLF through it on the high spots.
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  #14  
Old 11-01-2013, 09:28 AM
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Quote:
Originally Posted by RidiculousM View Post
Looks like the preferred epoxy primer for sealing/prepping fiberglass work is PPG DPLF then PPG K36. I have K36 and PPG Super Koropon epoxy primer. Will the Super Koropon work in place of DPLF? I have tried calling PPG tech help @ 1-818-627-3703 and unable to get answer/reply. If anyone knows the answer or a place I can get the answer would be great. I would simply order DPLF but TCP Global says its a no go in California.

Thanks

Mike
Check with the SCAQMD, their strict rules have exemptions for single users operating with limited volumes.

TCP Global may just be following the rules for commercial users.

If you like reading rules...

https://www.aqmd.gov/rules/
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  #15  
Old 11-01-2013, 08:16 PM
broken1234 broken1234 is offline
 
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Mark, Dan is again correct regarding the "why"... K36 will adhere, but DP__ will adhere better. Also, a nice tip about the color difference.

Over gelcoat, it probably isn't a "must-do"... more work, weight, and cost, plus it's something else you can screw up. On the other hand, if you don't properly prep or clean, or don't know how to properly prep or clean... it may protect you from yourself... ;-)

Most of the time, on customer's planes, we do not use it first. But I always discuss the option with the customer and let them make the call.

Brad
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  #16  
Old 12-07-2013, 02:27 PM
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I'm late but can I jump in your sand box? Just shot DP 90 LF epoxy primer on the pants, wholly Molly this sure does amplify pinholes! I used this on the emp fairing and found it extremely sensitive to temps while shooting, runs. On the other hand, it does wet sand nicely
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