The MinWax method is really easy and it works. I've been flying my MinWaxed FT Mini Scout a lot lately, and the plane has gotten a bit moist a couple of times from bellylanding in wet grass & flying for 10 minutes after it started drizzling rain the other day. The plane has held up really nicely even with the wetting. The paper inside has some delamination issues. I wish I had peeled it off to begin with - or minwaxed the interior before sliding on the wing. I use cheap hobby acrylics for paint, I apply it with a Paasche single action airbrush.
Your FT Mini Speedster looks very nice. Let's see it with Minwax & paint on