When I worked as an electrition at Cessna I would use special ones in the engine compartment that were for high heat use. I have no idea where to get them now, maybe WW Granger. The colored ones are more fanciful and I don't believe for extreme use. The tear away ones are definitely out. We have a farm store nearby, ok within an hour drive, that have colored ones that are marked on the bag for outdoor use, and some that say for indoor use. I believe it is the UV resistance that makes the difference.