Rockguard needs to be painted after. It is very porous and will actually hold water. After it is applied and tack dry, paint must be applied
Box liner (rinoliner, armaquard...) does not need anything on top of it after.
Rockguard is really only effective on dry, sanded, rust free body. If there is bare metal, an etching primer or epoxy must be used first
My advice? Canadian tire style rock guard is mostly useless, the way the average joe uses it. It needs to be painted. Instead of applying it after the rust is there is pointless. Instead pay a body shop to apply it properly then paint it, when you first buy the vehicle
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