I've done the rit dye thing on two comp-arf and if i recall correctly, I had a thermometer to measure the temp of the water. My tap water wasn't hot enough, so would keep adding pots of hot water to the total solution to keep the temp up. I don't recall what the temp needed to be but I do know that I had to dye the one twice because the temp of the water wasn't high enough. I wanna say tap water was like 150 and temp needed was 170 but I really don't recall. I think i put in the extreme composites edge 540 thread. early on.