Heat the covering with the gun or iron until the bubbles go down. Then use an oven mitt or pot holder to press it down over the solid areas. Don't push too hard though, just trying to make sure the adhesive is in good contact.
Symantic point:

ARF's are assembled, not built. Sorry but we kit builders are picky on that definition.
We're just glad you're with us and preparing anything for flight.

We'll nit-pick you but only in good nature.
Thin CA only. Test fit ALL parts before getting any adhesive near them. Once the glue hits the fan it's too late to make corrections.[:@]
Some ARF's have better directions than others.