hi new to the boards here, i have a 82 z im restoreing putting in a new floor pan. my question is after its in and i sandblast everything should i prime/seam seal / por15 or rust bullet or whats the order ? learning as i go here .

 

Are you welding, or riveting in the new pan?
Unless you're welding around the ENTIRE structure, it ought
to be sealed. Auto-body seem sealer (available at most parts
stores) will work, but is a bit pricey. A good sillicon sealer will
probably work as well, for a few bucks less.

Let me offer on the remainder of the installation,
based on my experience w/ the 90 Formula.
There is a VERY TOUGH gray primer on the undercarriage.
I personally would not sand-blast that away. And I hope you're
not considering sandblasting the interior, unless EVERY thing else
is removed, so that you can actually hose it out when you're done.
For coatings, I'm going with DupliColor spray on Truck Bed liner
on the underside, for sound/insulation, and rust-proofing.
This particular brand is durable, yet lightweight & easy to apply.
The super tough coatings like POR-15, Rust-Bullet, etc., are excellent
products, but require good surface prep, are kinda pricey, and have
no insulating properties. Inside, underneath upholstery, I would think
something like RustOleum would be sufficient, which is what I did
on another restoration project.

Good luck.

 

i am welding in a new floor, everything is out of the interior. so after i finished fixing all the rust should i prime it then seam seal or seam seal after i use rust bullet or por 15, i plan on repainting inside the car also with a color

 

Seam-sealer, then primer over that. POR-15/Rust-Bullet/etc. all cure to
VERY hard surfaces, so you have to be careful about what you apply
over them. Each manufacturer will have detailed instructions about this.

I assume the floor-pan is being installed from the inside. So it is most
important that the underside seam, exposed to moisture/dirt, be properly
sealed.

You don't provide much detail about the rust you're repairing -- is it
rusting from the inside-out, or bottom in? It might sound trivial, but
if it's inside-out, be sure to address how moisture is accumulating in
the cabin.

If everything is out, this sounds like a pretty thorough restoration, so
good on you. Take your time, be thorough, and you'll be much happier
with the results when you're done. That being said, I still think that
POR-15 type stuff on the inside, is a Quixotic endeavor. Save that
effort for other areas that are more exposed to rust-creating conditions.

And don't hesitate to post some pictures. We all like to ooh/ahh at
our brethren's efforts.

 

thanks for the info will post some pics when i can

 

Don't use anything containing silicone. You can't paint over it and it could cause fisheye's in any paint you use on the exterior later. Any product containing silicone shouldn't even be in the shop when you do paint work.

 

3m has a nice seam sealer and yes use it first.