I think I must be impaired when it comes to using spray starch. The very first time I tried it out today, I scorched the starch. I admit I sprayed too heavily (I'm not sure it's possible to spray lightly with the particular can I have) so the fabric was saturated, and I admit the iron must have been too hot. Still, the iron hadn't heated up completely before I used it.
I always seem to scorch starch if I try to iron when it is wet. It never seems to scorch on me if I let it dry in the fabric first and then use steam.