I want to heat shrink the inside conductors by twisting two together and heat shrink, but i noticed that the jackets on them arent very good, my hair dryer melts them if i hold them there a bit. it doesnt take long before the the tip of the jackets begin to droop. and the jacket around the internal conductors warp slightly. i test this on some scrap pieces, before shrinking. But this has me greatly concerned, a hair dryer melts the jackets, I have a heat gun shipping here from Parts Express, which will have an even higher heat concentration. if the jackets were to melt slightly while heat shrink tubing, will it have a adverse affect on the copper inside?