i hold my iron upside down and let a small pool of wax sit on it, if the wax smokes i turn it down... if you let the wax smoke it burns all the chemicals out and basically does nothing for your board and it is bad for you to breath in.
as for too hot for the board... if it becomes warm/hot to touch on the other side turn the iron down or dont let it sit in one spot for so long... always keep the iron moving. your board may become slightly warm on the other side, but anything more than that, stop and let it cool
edit: also, dont assume that one type of wax will melt at the same temp as another.
Last edited by andrew_schenk; 02-02-2008 at 06:34 PM.