We've been disappointed even by polyester/cotton blends and dyes. Even the blends don't take the dyes well, so I wouldn't risk it. I think you'd just lose your money. However, I've seen lots of really nice burgundy curtains in thrift shops lately that look great and don't cost a lot. Good luck!
Don't waste your money, it doesn't work and you end up with something you won't like at all. I tried again recently and boy were the results ugly...argh! Dye has really gone up in cost in my area so really felt doubly foolish thinking it might work "this time". It won't.
Polyester will not take Rit dye. There may be other dyes available through specialty shops online but Rit works best on natural fibers like cotton or silk.
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