Well, I ended up just getting another tiny can. On the upside the body came out better than I expected:
Although sadly adding the race car number will be detrimental to the look
Next I guess I'll have to take another look at the diff, probably some extended free-revving to see if it leaks or if its just the "overflow" from the assembly that sprayed some drops after the initial assembly. Not gonna be much fun for anyone if the car leaks oil onto the track!