I have a John Frieda heat protectant spray called "FRIZZ-EASE - Heat Defeat Protective Styling Spray | Nourishes + Straightens Hair | For straight styles". The instructions say to spray on damp hair then blow dry straight. Do I need to re-spray it before I straighten my hair with hair straightener? Can I also use this spray when using a curling iron or not? (Sorry if this question seems a little stupid, I have no idea about this kind of stuff )
Heat-protectors are generally for use with blow-dryers, flat irons, curling irons, and any other device that applies heat directly to your hair.
I reapply before using any heat device.
But I find that creamy "blow-dry straighteners" work better for actually helping to straighten the hair while blow drying than a spray, but my hair is naturally wavy/curly and very frizzy so it needs a lot of help getting straight.
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It's not going to burst into flames or anything like that but unless it's designed for hot styling it could potentially damage your hair, nothing noticeable short term but I wouldn't do it every day.
I use that all the time! What I prefer doing is letting my hair dry naturally overnight and straightening it first thing in the morning. I spray it on just before I straighten.