Usually comes out smooth, after being rolled in a mailing tube when we buy it straight from theatrical wholesalers
Rosco, Lee or GAM can all be creased if folded tightly. It does not affect the transmissivity of the wavelength in any substantial manner.
You are not trying to take picture through it, though. It is just to filter broad spectrum and emit only the specified red frequncies. I acknowledge that freqeuncy is not quite the right word to use here.