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If you're applying by hand and the cars in fair condition then maybe skip the SRP and go straight to glaze. If you were willing to work the SRP well to try and get the benefit of its cleaning and very mild abrasive then it would be worth doing both.
SRP does have a very mild cleaning ability that will help create a better base than the glaze for the wax and glaze to sit upon, so depends on the state of the car really
That's what I thought; you'll have to really work the SRP to get it to correct. You'd be better off using something like P1 if correction is needed instead of just filling.