check the INCI of the hair protectant - they tend to have alcohol denat. in them more often than not - this would
I know CG doesn't promote using silicones, but nor it does promote using a curling iron...
so if you want to use the curling iron then you should protect the curled strands more - try finding a silicone-pacted "silk" serum without alcohol - it's the best heat protectant you can get probably
but using this will mean you'd have to use a simple claryfying shampoo with SLS from time to time to get rid of the unwanted silicone-buildup so this all really depends of how full-on CG you want to go or if you want to go CG at all