I dont like them myself except for the very final sanding. NOTHING works as well as a length of 1x4 inch block of hardwood for making panels straight. Use wood dowel rod for curves. If your repairing a body line, nothing but a hard block will work good. I can fix panels with intricate body lines to so straight it cant be seen that any other shops will only replace and not even attempt to repair. I do it all by hand too, no airboards except to rough it in. The blocks that have slots and hooks are absolutely worthless in my opinion. Using red oxide primer, you dont need to waste time and money with Guide Coat. You can see flaws just by the difference in color as you sand. Guide Coat is for people who dont know what theyre doing, lol. I use my hand as much as my eyes to fix panels...you can feel stuff you cannot see.
I recently got some of that rolled #36 Indasa and yet to form an opinion. Ive always used Green 3M stick it strips.
[This message has been edited by rogergarrison (edited 12-22-2014).]