Working with soft plastic

It might be polyethylene.  I had the 1/25 Cheiftain, and it had snap together track links like your Tiger.  The pads were separate and molded in black instead of metallic grey, and you were instructed to use the old hot screwdriver trick to secure them to the track links.  The plastic felt like poly cap material.

What do you need to fill/glue on the tracks?

I built that back in '72.
I used the old tube glue (old formula).
It's still  sittin' pretty in the bookcase at present.

           

Went by the instructions since there wasn't really
anywhere (other than the box top) that you could
find any info back then.

Try using epoxy to glue, and Bondo body filler to smooth irregularities. I'd use the Bondo outside since it's so pungent.

Real G

The plastic felt like poly cap material. What do you need to fill/glue on the tracks?

I does feel very similar to the poly caps. There are some spare treads at the front plate, which will be stowed with the guide horns and road wheel side out. There are numerous ejector pin marks and the molded track pins are visible on the inside, as well. I can live with it on the mounted treads, as I set out to build this largely OOB. But I'd like to clean up the stowed extras a bit, anyhow.

disastermaster

I used the old tube glue (old formula).

Yeah, I tried that first. It dried overnight, and popped off cleanly the next day. No adhesion at all. Ditto for the liguid cement/MEK types.

May hafta resort to that, Cobra. I was hoping to avoid the hassle of it.