Originally Posted by Snowolf
Heat builds up through the waxing process. In order to actually damage the board, you have to really be careless and leave the iron in one spot for too long as has already been posted. You are fine and that heat is quite normal. You might have taken longer than you really need to in order to spread the wax. This is common and I myself have spent way longer than I need to. The base will only take so much wax and repeating the process only wastes wax and your time....
Take responsibility mate, you owe him a new deck!