I have my cab off the frame and getting it ready for paint. I am cleaning out the sealant from the joints in the cab where the floor pan is joined to the fire wall and the back of the cab is joined to the floor pan and will be resealing these joints. Has anyone have a good choice of sealant to use for this or just a good paintable silicone. I am going to use AutoZone bed liner sealant in side the cab before painting to help keep noise down, insulate, and also help seal up the cab.

 

3m seam sealer , you can get it in either a chaulk gun type or brush on .

 

Use 3m seam sealer either single or two part. Also it's a waste of time using a cheap bedliner product to try and seal a cab. Unless it's a polyurethane or high build and flexible don't bother. The single stage stuff in the can is junk.

 

What gashog said!
While I can't speak for the AutoZone stuff specifically, the different liners and undercoating materials vary a huge amount in how they insulate from both heat and sound.
For example, Raptor Liner looks and feels fantastic, but does neither from an insulating standpoint. My '68 has Raptor and it's just like riding in a tin echo chamber with built-in heater! My '71 with simple carpet and jute backing and some spray on rubberized undercoating underneath is tomb-silent by comparison. Another friend has a pro-applied bedliner or some kind and it's completely different sounding than the Raptor. Very quiet, and not half bad and blocking heat as well.

I would read the container very carefully on your chosen liner then. Just to be sure that somewhere it says it's an efficient sound-deadener. And is not made for AutoZone by Raptor!

Good luck.

Paul

 

When I replaced the floors, rockers & cab corners I seam sealed the edges. I first used SEM in a caulk gun to force the sealer into any openings. I let that setup a few days then used SEM brush on seam sealer and went over the top of the first, both top & bottom seams.

I then used Dupli Color bed armor top & bottom with 2 coats. This was not so much for noise & heat as I plan to install jute & carpet, but to protect the metal a little.
The spray on under coat can leave pin holes that water & dirt can get in and start rusting the metal. Thing is you can not see this till too late and you peel off a sheet of under coat and see the rust holes.
Now I will say I did not follow the directions to a Tee and when installing the seat scraped some of the liner off the floor I will touch up.


Dave ----

 

I've used the SEM seam sealers, they have worked well for me.

 

 

Well if I use those joints I wont care what the other joints look like.

 

The SEM sealer was what I could find here so that is what I went with. I will probably use Hercules bed liner since that is what they have here in my area of the world. I could order something different and then I have to wait. Paris,Tx is a small city and full of auto parts house and only has about 3 wrecking yard. I did find 6 doors in one place that fit a 69 and up ford truck and they may work on a 67 and 68 too I just don't have one to look at. The doors had the metal door plates and the trim around them and two of them have the wood grain and padding on them. I bought those doors for $50.00 for both and stripped the padded and wood grain off to put on mine and sold the doors for $40.00 each. Now I can buy more parts for mine.