would weld bond stregthen the car, if you put it allong the structual pannals of the car that are spot welded. would it stregthen it at all?

 

i just welded my engine/ tranny mounts and added some braceing.

but, it should. look at the rally cars. they are fully welded, most drift cars are also.

 

You don't want to "fully" weld the unibody of your car. "Seam" welding does add rigidity to the chassis however fully welding it would lead to problems down the road. If you plan on racing this chassis or even street driving overtime will still flex the unibody and if you fully weld the seams it's going to start to crack at the weakest point...the base metal of the panels. You want to run short beads about and 1"-2" with equal space in between the welds to allow some flex and if it does start to crack the entire seam won't crack under stress just in short sections that can be easily repaired.

 

Apparently 3M makes a new seam tape some of the Drifters are using I have no experience with it but you may want too look into that as an alternative

 

well butyl tape, or seam sealer is used on the seams to prevent moisture getting into the seam from ambient air, in effect thats the only thing that prevents rusting.

I never heard of tape holding a chassis together. Structural panel glue maybe, but that would have to be put inside the seam.

As for strengthening welds, its not a bad idea, but you do it like so 1" seam 2" space and then 1" seam. Or another method of double spotting, which is spots in between factory spots. Makes the car alot stronger, but allows some body flex, so that it wont crack from another seam.