One of the fender fuel tanks on the T-55C1 BUBLINA was a short-shot cast. The plastic didn't get all the way into all the corners of the mold on some of the sprues. This part was one of them.
I first tried to make a quick aluminum foil form to melt/cast a new upper part of this fuel tank by melting some sprue chips from this kit.
= Fail
NEXT:
Try using foil again to make a partial patch, then fill in the back with glue and material.
= FAIL because it still leaves an un-sandable layer.
Finally I use silicone gasket material in a tube to make a quick and inexpensive mold:
Then cast with casting resin. This worked and with a little putty and sanding will look fine.
The rear lower hull part was also "skinny" on one of the spare track studs. I snipped off the parts I need from the SLA APC-55 kit to repair the BUBLINA. The i-sheets in the SLA kit says to file off and remove these anyway so it was perfect
Thanks for looking . . .