Sealant for the roof rails

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74_Coach said:
I am still fighting the front cap seam and I have tried just about everything except butyl. I think butyl would be very messy especially when it gets hot and I doubt you can paint over it.
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As 74-Coach says here that the front and back seams are a potential issue. I’ve seen pics of some pretty narled up metal after what appeared to be a attempt to dig out old butel sealant. I’m hoping not to do that. Is there a recommended seam sealing method for front and back seams?

Thanks,
Tom
 
Billygoat said:
As 74-Coach says here that the front and back seams are a potential issue. I’ve seen pics of some pretty narled up metal after what appeared to be a attempt to dig out old butel sealant. I’m hoping not to do that. Is there a recommended seam sealing method for front and back seams?

Thanks,
Tom
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Self leveling Dicor seems to work well. Tape off the seams, about an eighth of an inch past the edge of the seam and pull the tape as soon as the sealant has been applied.
 
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Carl Stouffer said:
Self leveling Dicor seems to work well. Tape off the seams, about an eighth of an inch past the edge of the seam and pull the tape as soon as the sealant has been applied.
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Self-leveling Dicor across front & back roof seams stopped all leaks when I did this, but I didn't think of masking tape - that's a great idea.
 
I ended up using:

3M Marine Adhesive Sealant 4000 UV​

So far, no leakage. I did notice that the mounting bolts for the rear roof mount AC were loose. I tightened them up but never had a chance to check during a rain storm.
 
I just ran a strip of eternabond. Fixed any leaks. Also used it at the windshield/roof seam.
 
GMCMI Fall 2026 Rally
Applied GMC

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