THIS is a lifesaver! Works good as heat, but does not damage plastics or refinished surfaces.there are cheaper alternatives than loctite, btw...
Another thing to consider is to know your material. For example, when removing plugs from aluminum heads the engine should be cold. Every time you remove bolts or plugs from hot aluminum there's a chance the aluminum will adhere to the steel and strip no matter how careful you are. Some alloys are more susceptible than others, but if at all possible, pull plugs cold. Then use anti-seize to reassemble.
Don't forget when using anti-seize, reduce your torque # by 25%. Too easy to over torque an oily bolt (and I love the stuff..use it all the time)
This is from painful experince. I always use anti-seize on any bolt or sparkplug that threads into aluminum, it keeps the threads from galling.
I used PB Blaster for years as a HVAC tech. Then I came across KROIL, it works even better than PB. I buy it on line in a squeeze can instead of the aerosol can. It only takes a few drops, wait about 5 minutes, and out comes the bolt.