I have a few questions about sealing my floor. I'm getting ready to apply POR 15 to my floor boards, and I'll be following that up with DynaMat. At what stage should I re-seal the joints? Before I paint or after the POR 15. Also, which 3M sealer would you folks recommend. I see they have a few different types.
Thanks...
The metal of the floor should be, at least, in primer before applying seam sealer. Can't help you with 3M, I used SEM. You'll need at least two different types. The chalk type (in a tube) and some brushable (in a can ) if you start sealing the vertical surfaces such as the inner window frames above the floor. Be prepared to buy a gun for the tube type, usually requires a special chalking gun. And the stuff stinks to high heaven!
I bought all my stuff thru Autobody Toolmart. Not the cheapest but they do carry a lot of stuff.
https://www.autobodytoolmart.com/searchnxt.aspx?keywords=seam+sealer
I forgot to answer you main question, before or after POR15. I wouldn't apply over POR15. Main reason is unless you go to a lot of care to make sure the metal is well preped and the POR15 will stick 100% then the sealer will just come off with the POR15. I guess that's true with primer but it seems to be easier to get the primer down correctly than POR15.