Replacing floor tar?

[EScanlon]

If you are going to use the primer as a "stop-rust" item, be aware that primer is in fact, porous. If that is your intent, then get some paint with it as well.

The key thing in choosing the primer is being aware of what you will be topcoating it with later. If as I stated above, it is only a temporary coat, any primer will do, just be sure to apply a paint of the same brand/type as the primer. Then when you go to apply the final paint job, then have the whole car sanded and primed with the appropriate primer for the paint to be used.

This is to avoid problems with the paint either immediately after painting or later down the road when the paint completely cures.

2¢

Enrique

[Zhorse]

I used Dynamat Xtreme. A box of nine pieces of foil-coated Xtreme (each about 12X15 inches) cost me $100 on eBay. This covered the entire front floor of my '76 coupe, including the vertical panel behind the seats. My floors were in fine shape, no rust, so I just put the Dynamat right over the old tar stuff. It's very easy to cut and shape. Once it's formed to the area you want, you peel off the backing and it's stuck there for good. One of these days I'll buy another box and do the back deck and maybe roof and doors. Just doing the floor made an amazing difference in how quiet the car rides. I know that some of the other makers are cheaper, but I'm happy with my choice of Dynamat. It's a nice product that does what it claims.