...but am confused about covering the airplane...
Covering a FT plane is completely optional. If you are using the original DTFB, you will want to waterproof it, landing in dewy grass will reduce the strength of the FB. I use an oil based polyurethane, the stuff used for wood working. Wipe it on, let it set an minute or two, then wipe off any excess. Anything that is not too heavy and will not destroy the foam will work. Paint, colored packing tape, vinyl covering are all widely used. Use caution with rattle can spray paints, some will eat the foam, it's the propellent, not the paint. If you hold the spray can 18" or so away from the foam, it will allow the propellent to evaporate. All water soluble paints are foam safe, something like apple barrel acrylic paint from Walmart. Low temp airplane coverings films will work with caution, ~200F. High temp coverings will not work, they melt the foam, ~350F.