F8fan,
First off, welcome to RCU!!!!
Bruce was right, you think it's hot there???? I live in Southwest Oklahoma and it's normal to have 3-4 months of 90°-100°+ weather every year. I store ALL of my airplanes and radios in my garage which regularly hits temps of 130°+ and I have never had any issues with them. It is possible though for the covering on an ARF to wrinkle up a bit when in heat like that, but if you take a heat gun or covering iron and re-shrink the covering you shouldn't have any more problems with it. All of the planes that I have built and covered myself never have any issues at all with the covering wrinkling. Anyway, these few days of hot weather you all are having up there shouldn't affect your plane at all in your garage.
On gluing the wing, follow the instructions that came with the plane. I assume you have the Hanger 9 Alpha 60 trainer, the instructions can be found online here [link]http://www.horizonhobby.com/ProdInfo/Files/han2600-manual.pdf[/link] . If you look on page 8 it explains assembling the wings. Here's what they say.
Step 1
Remove each wing panel from its protective plastic bag. Remove the pieces of tape that hold the ailerons in place for shipping. The hinges in the Alpha Trainer have already been glued in place during manufacturing. Check to make sure hinges are secure by gently pulling on the wing and aileron, trying to separate the ailerons from the wing. Be careful not to damage the wing structure.
Step 2
Locate the aluminum wing tube and carefully slide it into the opening in one wing panel. Use a twisting motion while inserting the tube. A short metal pin is located near the trailing edge of one wing panel. This pin keys into the opposite wing panel and keep the wing from rotating around the wing tube. Carefully slide the other wing panel onto the wing tube. Align the metal pin in one panel into the hole of the opposite panel and press the two panel stightly together.
Step 3
Locate the clear wing joiner tape and apply it to the top and bottom of the wing along the joint. Start at the top of the trailing edge and wrap it around the front of the wing and to the bottom trailing edge.
They call for putting the wings together on the wing tube and using tape to hold them together. You should follow the instructions from the manufacturer, because if this fails they will be the one replacing the plane. While some companies my be fly-by-night and not put much money into research, I can assure you that Hanger 9 isn't one of them. If they tell you a method of assembling the plane you can bet that they have done their research on it and they have found that this way will work just fine. And if in the event something does happen Hanger 9/Horizon Hobby have some of the better customer service out there and they will take care of any issues you may have
Hope this helps
Ken