Lifting problem??????????? kinda long

[14424]

Hello everyone!
I had a bad day yesterday but it's my own fault. Here's how it went.
I am painting some bike tins to put on E-bay. I have a primer of PPG NCP, catalized-- then a base coat of HOK BC 25? white not catalized--then PPG DBU silver, catalized--then PPG 2020 Clear, catalized. I let the clear dry for 2 days in a warm shop. I sprayed Crystals (from Exotic Paints) went over the Crystals with PPG garnet red met. catalized, washed off the Crystals and continued with the garnet red where I wanted the color to completly cover up the parts-----and the paint lifted where I went heavy with the red? I wiped the surface with my finger and it came off down to/through the HOK white base, so I think the HOK didnt like the PPG red?
So here is my real question? where it lifted is at the rear of all the parts. What I mean is the front fender starts out silver goes into red crystals and then the red covers completly at the rear of the fender. Gas tank and rear fender are also the same way. Since the lifting is at the end of all the parts, can I wait for it to dry sand off the lifted area up to the crystals (which are good) and re primer-- white base--silver--skip the clear since it was only for the crystals-- and go to dust coats of red??
I hate to have to sand off the whole thing. Lots of time, material and all.
I certainly know about mixing paint products but HOK is suposed to be so user friendly and it was under 2 layers of catalized paint and clear?
One of the things is that the PPG store is 3 miles from me but limited on the wild colors and knowledge and HOK is 25 miles away.
OK I am done. Can I sand it off and rebuild?
Thanks in advance and sorry about the rambling on.
Be good, Jim

 

[rex]

Ooh,could be a few things (got you other post earlier).I want to say it's the DBU reacting but it could be something with the crystals or even solvent entrapment.It wouldn't hurt to try to fix it but if it doesn't work start over with DBU white and the rest should be fine.I know it's the wrong answer but.....

 

[14424]

Rex,
whats weird is that I put DBU DIRECTLY on the HOK white base and it was fine?---Then went with PPG clear--- then crystals (being water based I dont see how they could cause a problem, they get washed off with water and all was fine, but?) then PPG DBU red which almost instantly lifted?
So-----I kinda think solvent entrapment might be right? But if the DBU solvent attacted the HOK white base, what about the silver DBU that went directly onto the HOK white??
I looked at the parts today and think I can sand the lifted areas down and respray the PPG red as dust coats, then clear.
Be good, Jim

 

[rex]

What are the timeframes between each application and how close were the reducers to the actual temp?I can see the red over the crystals doing weird things but the part that I'm not sure about is why did it come off clean to the first coats of white through the clear.Solvent trap is the first thing that comes to mind but I can't say without the above info.

 

[14424]

Thanks for the reply,
the epoxy primer was on for close to a week---then white HOK base---overnight dry time---silver with o/night dry time---clear with 3 day dry time--- I sprayed the crystals and waited about 1 hour untill I added the red ontop of the crystals, waited about 1 hour before I washed them off with water---started respraying the red heavy to cover completly at the rear of the parts and it lifted from almost the first coat.
My shop is a bit on the cool side here in upstate ny.
Part of applying the crystals involves sanding in 1 direction with 320 grit. The clear sanded nice and was hard.
I think I am going to let the parts sit for about a week, repair the damage and spray on a coat of PPG epoxy sealer and retry everything.
C-ya!!! Jim

 

[rex]

OK,you didn't say the reducer you used but it sounds like all the original bases were fine,it had to be putting the res on too heavy over the crystals.Go easy with the DP,it's a slow drying product and will aggrevate a wrinkle easier than a primer surfacer.Just put a light medium coat down and let it flash 15-20 minutes,then repeat.Go a little easy on the red and it should hold down for you.