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Getting a little more technical, the difference between 123 and Gardz is the Gardz is thin like water and has no opacity but can soak into the surface of the filler and seal even the little pores where 123 sits on top a bit more because it has a bit more body.
Airhead-
This is great intel, and something only us lay folk would find out after throwing money at all the various products. Appreciated as always.
I have some bare hardwood interior window sills that will need painting. The plasterer recommended Zinsser Stain Block for those as he said it's shellac based. Does that sound right?
stevo_com
The primer -Zinser or whatever you’re using ( I always have SBR knocking around) is to stop the new filler absorbing more of the water in the finish coats of paint than the surrounding existing paintwork, not to cover it with an opaque layer.
When filler isn’t sealed it can grin through - this is especially noticeable with paints with a sheen.