If you have started with Minwax, could it be safe to say you are
buying your finishing products at one of the big boxes?
If so, they should have the solvent base poly. The highlight of
Minwax products is that they are made to be quite forgiving, so you
may be OK. But before you dig a deeper hole, try here:
Note there is a phone number under the address.
I hope you post your results after contacting them.