Automotive Body Seam Sealers

[CaddmannQ]

What’s the best stuff to use on the bottom?

I’m going to have seams to seal in my modified floor pan, which will be mostly pre-painted in black acrylic enamel.

Also, some will be applied to bare steel. I’ll want to paint everything after sealing anyhow.

It should be easy, durable, and inexpensive. I’m not going for a show car look.

But I’m willing to spend what I should.