putty tape

[fishfighter]

Rebuilding a truck camper,I'm at the point of reapplying the trim. Under the trim, there is putty tape on the seams. My question is, does one apply the tape to the seams or best to apply it to the trim first? I know it sounds kind of dumb, but it seams to me it would be best to apply it to the seams first that way you know for sure the putty is covering the seam up.

[Clay L]

I have always applied it to the seam.
Note that there are two types of putty tape used by RV builders. One is the regular putty tape and the other is a butyl product. It is stretchy and doesn't put apart like regular putty tape.
The butyl is what is often used behind windows and trim.

[fishfighter]

When I had removed the old putty tape from the trim and windows,it was a regular putty.

What I did and I'm still doing is using 3M 5200 sealer under and inbetween everything first. If that stuff works for boats to be used underwater, that should block and stop any leakage in the future.

[Luv2go]

I used 3M 4200 (very similar to 5200) when removing and re-sealing the leaky windows on our old coach. On some I just used 4200, on others I'd use Butyl tape and the 4200. Both methods worked very well, no leaks.

Stewart

[fishfighter]

Thanks for the heads up Luv2go. Once the 5200 drys,it doesn't come off.