Today I went to the store to check out this electric heat gun. I was intrigued by this electric heat gun. Maximum temperature is around 1000 F. I was told that the heat temperature maximum of 1000 F is not hot enough to generate heat down to the thread. So I barely let go and not buying this electric heat gun with reservations. Next I got the 3/4 inch enclosed wrench and a 2.5 lb sledge hammer as a backup. When I got home, I went to work on that stubborn bolt. Barely enough room for the enclosed wrench to get on the bolt. However, I had some more room to play along with little leverage to turn the bolt clockwise facing me. With a strong pull toward me using my hands on the wrench, the bolt finally moved!!! I did not expect that at all. I was truly surprised by this!! I thinked it has something to do with JB Blaster and the thing about that is I left JB Blaster soaked through the head bolt overnite. In any event, upon looking at the top bolt with six points, five of them were stripped. In comparison with the earlier bolt that I had removed, the other bolt had only one stripped point. Must be lucky for me. I am going to replace those two caliper bolts with new ones, to be safe. Now I can cancel the trip to the shop!! Thanks guys for all your feedback, comments in this post. You guys rock!!