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Old 09-21-2012, 05:28 AM
Brad4321 Brad4321 is offline
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Basecoat Did Not Adhere

I have gotten myself into another newbie screw up, but I don't know what I did wrong and could really use some guidance.

This is an 05 superduty. I had some major bodywork on the bed, but the cab was sound. Original paint was sanded flat with 180 (did not break through to metal) and I sprayed 3 coats of SPI 2k. That was sanded flat with 320 and then 600.

4 coats of TCPGlobal's Restoration Shop basecoat was applied (coverage was less than expected) with a half hour between coats. Outside temperature was 66 degrees with a humidity of 40%. I only had slow reducer in stock, so I have it a much longer recoat time to be safe (TS says 10 minutes at 70). The base flashed off in approx 10 minutes. The basecoat was activated with SPI clear coat activator.

I waited 1 hour and shot SPI Intercoat Clear with HOK Ice Pearl. 2 coats, 30 minutes between coats. Intercoat was activated as well. Temperature was 75 degrees at time of shooting intercoat and stayed above 65 degrees for about 6 hours. I do not know actual metal temperature.

Truck sat overnight and 5 coats of SPI Universal was applied with 45 minutes between coats, normal activator with a air temperature of 75 degrees.

The truck was untaped the next day and pulled into the sun. I have waited 1 week in the sun (as I normally do) and started color sanding. I then noticed the basecoat is peeling off of both front doors in sheets. I have attached pictures in this link: Paint Delamination pictures by Brad4321 - Photobucket . I also added one picture of the hood a day after being painted. The paint looked really good, layed down like normal, and I didn't expect this to happen.

In the peeled paint, I can see grey outlines of where I sanded. This is the first vehicle I sanded with 600 before basecoat, I have always stopped at 320. I sanded to 600 as I read on here that it gives a smoother finish to metallics, pearl, flake, and etc. I strongly suspect that this is the source of failure, but I am not certain. The temperature was also marginal, but I have never had problems before with this temp.

It is actively peeling from both doors, but not from the rest of the truck. It may very well peel from the entire truck, I haven't tried past the doors. I should also mention that I used SPI waterborne and tact rags as well.

Anyone know the cause of this and how I should fix? Can I sand it back down to spi primer or will I need to start all over?
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