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Old 06-25-2016, 03:52 PM   #1
Junior Member
Join Date: Oct 2015
Posts: 28
Results on my "crazed" (checked) fiberglass repair

I know some skeptics will say "wait another year or two" and let us know, and I will do that too... but I can't fastforward time, I can only give you results to date.

When I bought my 2001 Class A it had the dreaded "alligatoring", aka "crazing" aka "checking" on the fiberglass panels. The story goes that there was a defect in the panels during these years that allowed the crazing to happen over time. Mine was unpainted, it was just white gelcoat panels with graphics over them. The crazing only happened under the graphics (which were dark colored) and at the edges of them. This made it clear that the defect (at least in mine) was exposed because of heat. Those dark colors would be too hot to touch in the Arizona sun, especially in the summer. I never measured the temp, but I would not be surprised if it was around 180F or higher. My graphics were toast also.

I was told you cannot repair it short of new panels. I decided to see if that was true because I wasn't prepared to spend that much money on redoing the whole rig.

What I did was remove all the graphics and sanded the exterior a bit. This removed all the high edges of the crazing. To fill it I took an epoxy based body filler (cream) and applied it all over the crazed areas to fill it, and then sanded again. I later found a spot I missed and used a regular urethane filler and it appears to have held up as well. From here I primed it with an epoxy primer and then painted it with a high quality (but not expensive) base/clear using a 2 tone scheme. I used SPI for the primer, Wanda for the base coats and SPI clear coat.

I don't recommend painting yourself unless you have a decent gun with very high volume air supply AND have an indoor place to do it. Mine was made difficult because I had a large, but still sub optimal air compressor and had to do it outdoors. Otherwise it would have been cake to make it look it great and not a drawn out project. If I had to do it again I would have taken it to Mexico. I spent close to $2k on materials IIRC.

Since I knew the heat is what was causing the crazing I kept it white for the primary color and made the two tone a light beige. Even in the peak of summer I can hold my hand on the paint of either. The beige gets warm to the touch but not hot.

It has sat exposed now in the Phoenix sun for about 2 years. This is the second summer. Not one single crack or craze has developed.

I just wanted to give hope to those who have the same issue with their rig and don't have the money to invest in repaneling it. Even if you did it doesn't often make sense to spend $20k doing cosmetic repair on a rig that might only be worth $20 to $30k.

The key is you need to use light colors. Anywhere you have a dark color I would bet the farm it will be back within a year or so of sitting in the sun, and even a medium dark color (medium grey, blue, etc) I would expect it to return. If you are trying to test your limits on how dark you can go I would paint a metal panel and sit it in the sun for an hour or two. If it is more than just warm to the touch I would avoid it. The dark color schemes can look amazing, but it is tough on these panels that suffer from the crazing. It also makes your rig a lot tougher to keep it cool inside when you're in a warm part of the country, so there are practical benefits for opting for a light colored scheme even if you really liked the darker scheme you had.

I will report back on how well it fares down the road, but I really don't expect it to have any issues. If it would I think the entire panels would have shown the crazing after 15 years and not just the parts under and adjacent to the extreme temps. Without extreme heat to cause areas to expand there is reason the cracks should emerge again since that is really the only form of stress on them.

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Old 06-25-2016, 05:15 PM   #2
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Posts: 1,667
Pics would be nice. Congrats on a tough and time consuming DIY project.

Our last coach's upper cabinets turned a lot of supplies into goo because of the excessive heat from those darker colors. Lesson learned... and it's also a big part of the reason it's taking so long to find it's replacement.

Why is it that manufacturers like those black and dark upper graphics?

Jan and Bob

RIP 'Squeaky'
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Old 06-26-2016, 05:48 PM   #3
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Join Date: Oct 2015
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I think I did take a couple pics of the process. I will have to dig out the old phone and see. I really think the hardest part was getting the decals off because they were so baked onto the fiberglass and they also ran along the entire top of the panels in addition to places you could reach without a ladder, so there was a lot of time on the ladder. I used chemicals, razor and heat gun and decal wheels and it was major PITA because on most of it I had to come back over it all with solvent and paper towels about 3 times before all the adhesive was off. You really can't just sand it off because it just works it into the glass which can contaminate the surface for painting.

On mine I had no choice but to repaint really because the glass was fresher under the graphics so I either needed to repaint or find an exact duplicate of the graphics and install those. I could have opted to just replace the graphics, but my basement was painted metallic grey and it was oxidized and the clear coat was peeling in many places. I was going to just repaint the basement and try to get duplicate graphics which would have covered the crazed areas, but I figured after all the time and work and I might as well just go full body paint and be done with it.

Once the decals are off it is actually pretty easy prep. Spread on the filler to fill the cracks, light sand. You can get away with just scuffing with a red pad all the rest of it but I hit it all with 300 grit lightly just to really be sure I knocked off all the oxidized gelcoat. At this point you could take it to discount painter and have a simple paint job done pretty cheap since all they need to do is rinse it, wipe it with degreaser, mask and shoot. I was constantly battling the elements trying to paint outdoors and while it did come out looking good, it was way more work and headaches than it was worth to save 3 to 5k. Some things are just better left to professionals who have the resources.
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