I personally do not like the "vinyl" welting and instead prefer the rubber welting used on VW's. That said, it may depend on just how much of a lip you have on the welting to go between the two pieces of metal. I only use one or the other but not both.
If you use the felt the #30 roofing felt works nice on most jobs.


1937 Chevy Pickup
In the Gallery
1952 Chevy Panel
In the Gallery
More photos
1950 Chevy Coupe
Pictures!

I'd rather walk and carry a Chevy hub cap than ride in a Ferd.
I can explain it to you, but I can't understand it for you smile