With Sig canopies and I think other brands canopies, they use two different types of clear plastic. The one kind will take the dye. The other type won't take the dye no matter how you do it. One time I bought two Sig bubble canopies. One was a bigger size than the other. I tried to dye them at the same time. The one took the dye and the other one did not. Use water only as hot as what comes out of the tap. Don't get it hotter. Also what looks dark enough in the basement won't look as dark when you get it out in the sunlight. Leave the canopie in the dye longer to get a darker color. Also move the canopie around in the dye. If you just let it soak in the dye the color won't be even. If the canopie you use won't take dye being soaked in the dye won't hurt it at all.