I have some rust on my floor pan and a few holes I want to sand down and fill up, anyone know what material or chemical to use? and what kind of sand paper, please help me with the process, because thisis something I would like to do myself. thanks

Here is a LINK to a company that makes a product to repair rusted metal. Search their site for the HOW TO aspect, and then do a search on our site using POR or RUST as your search word(s) and you find real world advice from many of us who have done this work.

If your floorpans are too far gone you can buy replacement pans to be welded in from Charlie Osbourne at http://www.datsunzparts.com/

http://www.stoprust.net/rust_bullet_guidelines.htm

no idea what happened to my comments ...

with rust bullet, clean area with metal brush, get all the loose crap out of the way, scrub it good. this will open up the rust holes ( make em larger ), gets rid of the too thin material .

put something under the car to catch the drips. use a good face mask, air filter, meant for noxious fumes.

paint a nice layer of rust bullet down. take some strips of fiberglass mat ( available at local hardware store ), cut em before hand, trial fit em, dry ( no rust bullet ). wear gloves !!! anyway, take the strips of fiberglass mat, lay em ontop the rust bullet, take the end of a paint brush and dab the mat into place.

paint more rust bullet ontop the mat, dab again. another layer of mat, more rust bullet and more dabbing.

i just did this of several small holes on the passenger side of my z ( holes were pin holes before the metal brush, ended up with about 6 holes the diameter of a #2 pencil of smaller ).

the rust bullet and the mat, worked great.

you also want to get under the z and clean up, maybe paint some rust bullet over the area underneath as well. if you need, use some mat there as well.

the metal brush and a vacuum cleaner to suck up the mess, is all the prep you need do for rust bullet.

http://www.stoprust.net/rust_bullet_faq.htm

if those holes are fred and barney size, for safety reasons, you may need to have new sheet metal welded in ...

if these cars had perimeter frames, like the 57 chevys do, you could get away with glassing and patching.

but, as the z is unibody, you need the strength of a solid floor. again, if just a few small holes, patch em.

if large holes that your feet fit through, suggest that you buy the replacement panels. strip all the tar, ect. off ... take z to local welding shop, ask there about having them to remove old and weld in the new.

welding shops are usually cheaper than a body shop.

once welded in, coat the new stuff with rust bullet or POR 15. inside and outside ...

also if the floors are rusted, check under the battery and your frame rails ...