i got some heatwrap to wrap my down pipe. i got the DEI 2"x50' roll. that should be plenty. also i got it in black. i have a few questions about the wrap.

heres how i understand it. i start the wrap and then get a hose clamp to clamp that down. then i wrap the entire downpipe and then clamp again where i stop wrapping. is this correct? the directions i have suck.

also how many times should i got around the downpipe? should i use all 50' feet?

thanks for any info