50 or more, go to a fishing store n see what they've got.
I've used the fishing line trick to remove emblems off of some of my cars and old nasty goobered on dealership plaques and it ALWAYS works if you give it enough heat and time.
what brand would be best?(i know ther all the same. but i like quality and right now i need good quality. i can always use the rest to go fishing.) and how long would it take to get through an area of about 6inx8in ish? would boiling hot water in the overflow help weaken the silicone?