Ok - here is where it is at...
1) Try not to be a moron, and read the instructions.
The instructions said put the varnish on wood. So what did I do?... I tried it on some shellac.
Rustoleum is the importer of Zinser in Australia, but they do not import the waxless Seal-coat (TM).
So I used some mastercraft flakes and put a strip on one side and a patch on the other.
Side #1:
Side #2:
For coat #1 I thinned the varnish 50% as per the instructions and it sponged in.
It was ~0C (32F) over night and about 15C/60F during the day.
I chucked it in the oven at 50C for an hour before sanding for coat #2
Coat #2 was thinned 25%
Same oven trick for 1/2 hour before sanding for coat #3
Right after the third coat:
I will bring it inside later and then chuck it in the oven tomorrow.
Then chuck it in the tub for testing.