Minwax is a polyurethane paint exactly the same as all the wattyl, cabbots etc we have available in Australia. You can use Cabbots crystal clear satin polyurethane, water based and identical to minwax.
BEANER: The website that showed you how to build your SU27 was not extremeRC.com. It is
www.extremerc.com.au and is my website!
Tasesq: sounds like you bought the gear from eflypower, the ESC's are pretty cheap, I would not be using them in parallel BEC wise, in fact I would not be using the BEC in them at all! I would fit an external UBEC, a good one that is fully shielded, that plane needs good power supply for the radio gear.