Sheet metal to sheet metal glue/sealant recommendations?
Getting lined out to start buttoning up my roof raise, and need some advice.
As the title says, Im looking for a good glue/sealant for sheet metal to sheet metal use. Sheets are 20 GA galvanized, and will be screwed together every couple inches as well.
I had hoped to use PL premium or the like (polyurethane construction adhesive), but further research indicates it needs at least one side to be porous, as it is cured by moisture. I don't think the middle inch would ever completely cure on a joint with 2" of overlap.
Our mechanic at work suggested 3M body panel adhesive, which is recommended for van bodies and the like, but I have three issues with it:
1. Two part epoxy is a PITA
2. Cost is $40/200ml. Yikes!
3. I worry an epoxy will be brittle and eventually cracked from vibration.
So, what have you had success with?