Paint Cracks - Diesel Truck Forum -
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post #1 of 3 (permalink) Old 08-26-2007, 04:47 AM Thread Starter
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Paint Cracks

The paint on the roof of the cab is cracking. Very small, hairline type cracks. It is in the two channels that run the length of the cab with the seam sealer in them. It started @ the back of the channel on both sides, right where the sealer joins the sheet metal. I'm thinking that the 100+ temps two weeks ago is at least partially to blame. Along with the truck sitting outside all the time.

Took it to two shops to get estimate to have it fixed, first words out of both their mouths was, "Isn't this under warranty?" "Umm, no. The truck is 5 years old", was my reply. So I guess my effort of washing, clay bar, waxing has not been wasted.

So, the point of this long winded post is, has this happened to anyone else's truck? Did you ever pin point a cause? How did you have your truck fixed?

The fix for mine seems to be grinding all of the seam sealer out of the channel, reapply new self leveling seam sealer, repaint & clear coat the whole roof panel. Oh yeah, hope it holds. Nobody is making any guarntees that it will. As both shops said that it could do it again.

Thanks, Greg

:03 F350 7.3 W/BTS Trans, Silver, CC, LB, 4" MBRP 304 SS Exhaust, 8" Edge Lift W/7100 Bilsteins, DR Dual Steering Stabilizers, 355/65R18 Nitto Terra Grapplers on Weld Sindewinders, ARE Z-Series Topper, 4 Isspro EV's Hangin' for the Windshield
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post #2 of 3 (permalink) Old 09-19-2007, 09:52 AM
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It happens to a lot of cars and trucks after a few years.. it kinda like the chalking in your bathroom or say outside your house around windows and such.. gets old, looses it elasticity and drys up and shrinks, and paint above it goes to hell... temperatures and the way the panels move have some to do with it as well and if any of them have ever been replaced.. but as they stated redoing it and it might do it again but surely not for a few years or longer...
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post #3 of 3 (permalink) Old 11-29-2007, 04:13 AM
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Had some hairline cracks on my hood and fender edges (probably from excessive heat) I recently addressed (2 months ago) the cracks were in the clearcoat. I have a clearcoat over silver paint.

Went to my paint/body guy who said that could mostly be buffed out after 1500-2000 grit wet sanding. I wanted him to try lightly clearcoating it. He told me to try it.

What I found was that progressive coats 1 super light, 2 light, and a medium 10 min apart worked wonders. Duplicolor says not to apply their clearcoat over air dryed paints, thats why I did a super light before applying the light coats. My friend was impressed with the results. He did one side with 4 super light coats which didn't work as well. We determined that the progressive coats would dissolve the hairline cracks within the bonding paint.

I prepped the area with 1000 grit wet sand before painting. I waited 2 days before using rubbing compound (per duplicolor). Next time I'll wait a couple of weeks (I saw that direction on another brand of paint) the paint gets harder and easier to buff or 1500-2000 grit sand.
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