I have used it now with positive results. However I boil the water and then after mixing the dye, i lower the temp to a simmer. This is still relatively hot. the negative effect is that the plastics sometimes warp and shrink just a wee bit. Has anyone tried this with just hot tap water and not using a stove top? or on the extreme side, has anyone tried dyeing with just cold water? is it just as effective? or does the heat actually assist in the dyeing process? I read on a Casio G-Shock watch forum, that people dye their clear jelly watches colors like we dye our toys. To the point the how-to mentioned using salt with the dye as that helps the dye take to the watch band. Has anyone tried this? I wonder if it helps.