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Old 09-14-2015, 11:43 AM   #1
2 Rivet Member
1974 27' Overlander
Twisp , Washington
Join Date: Apr 2010
Posts: 73
I'm back :)!

Been away from the AS for awhile, my little sister helped me set the shell back on the frame early last spring, but no progress since then until last week. Made some pretty good progress over the last week, finished securing the shell to the frame/deck, FINALLY got the bane of my existence, the ext. wheel wells, secured, and rolled it out of the shop last Thursday so I could bead blast the corrosion on the upper panel seams. Which brings me to the reason for this post.

As I feared, that corrosion has eaten right through the panels in several places. It's right at the seam between the very top panel and the next one down, both sides of the trailer. I still don't understand why these are the only seams that show any corrosion, they're so high on the trailer that there couldn't have been any standing moisture there, even if those particular lap joints never got sealed. But it is what it is, and now I need to deal with it. Replacing the affected panels is out of the question, so I'm going to have to patch. Which finally brings me to my question.

As I see it, I have two choices, a simple overlay patch, or a more complex joggle joint patch. Either way, I'm going to have a seam that laps the "wrong" way at some point. So two questions, which patch method is best, and do I need to be concerned about lap direction? Oh, third question, what's the recommended rivet spacing? I'll be using buck rivets, if it matters.

Which brings up my last (for now) question. I've blasted all the corrosion off, so now I have nice clean bare metal that's in need of protection. I have some Captain Tolley's on the way to seal the seams, but what should I use to actually protect the metal from any future corrosion? This is a one time project, the only time I expect to have the interior skins off in my lifetime, so I want to do this as right as I can. Thanks in advance for any help. Now back to it . Later.

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Old 09-14-2015, 12:32 PM   #2
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BIGED52's Avatar
1967 22' Safari
MILAN , Illinois
Join Date: Dec 2004
Posts: 2,012
Patch seams and panel overlay

Dave, If you are able to cut back the damaged upper panel say 4 inches you may be able to place a long patch panel to slip under the top panel edge and then have the patch segment bottom edge overlap the panel below it. It would mean a double row of rivets but using the Capt Tolleys and Acryl-R you should be able to get a well sealed repair on the panels without too much hassle. The other benefit of doing this now is since you are bucking rivets it won't appear to show as the repair is matching on both sides of the trailer. Yes, There will be an extra rivet line but not that noticeable to the untrained eye. Even after it is done you will be the most likely to notice the repair. The only other way to fix this would be total panel replacements and that would be very costly to do. I think you can do a good seam that overlays correctly and it will be visually very good as well as sealed the right way! Good Luck, Ed
1967 Safari Twin "Landshark" w/International trim package
2014 GMC Sierra 1500 Double Cab SLE
"My tire was thumping, I thought it was flat. When I looked at the tire, I noticed your CAT!" Burma Shave
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