Yup you asked a "build" question, not a question about a problem with a shipment. They only field the latter which is why you were referred here.

Re: Temp

A set temperature is not good to go by as if I give you a setting it may be either too cold or too hot depending upon your own technique.

What you should do is apply heat until you notice a slight discoloration of the covering. At this point you found the right temp. ( the normal color will return when it cools ).

Note that this point is right on the edge. A bit more and you can start damaging the covering, a bit less and it will have no effect.

That said, just a bit beyond where the discoloration occurs the material begins to shrink, a bit beyond that and it will tear.

You also need to be sure to first heat the seam areas with an iron. Get these affixed first. Then let them cool and get the surrounding areas, making sure NOT to get near the seams again. If you don't do this, the covering will pull away from the seams, exposing the wood under it, or just making it look poor.

I typically hit the seams with an iron, then I use a heat blow gun to get the rest of the plane.

I apply heat until the bubbles seem to INCREASE, then I continue in a widening circle which causes these bubbles to flow together. Once you have only a larger bubble, I pierce the covering if needed, with a pin to let out the air, or I merely let it cool, as the plastic shrinks when it does so. As it cools I smooth the covering with a heat glove. The glove is merely to make sure that the adhesive is pressed against the underlying wood.

The results can be spectacular... a wrinkly plane ends up looking like it has a fine finish.

No manufacturer is immune to wrinkles... I recently put together a Giant Scale U-Can-Do-3D that looked horrid out of the box. I spent a good 2-3 hours getting rid of the wrinkles on all of the parts and tightening up the covering.

One other caveat.

When doing smaller surfaces ( such as the elevator and rudder ) and control surfaces, place the item down on say a work pad on a flat surface.
Work on one side and as you go over the material make sure the item stays FLAT. Ideally clamp it down so it cannot bow out, etc.

As you heat up the covering the item can and will warp as the covering pulls tight. You want to be sure that this does not change it's shape. by flattening the surface, etc. as you start to remove heat. It's important to keep the item flat until it cools. Be careful with this.