Z-poxy works just fine for pore filling, i usually seal the top with a light coat of wiped or padded on shellac, as well as going over the z-poxy filled back and sides with a little bit of shellac, to ensure good adhesion for the finish.
If you want to try any other kind of sealer, test it on scrap. You can just brush or wipe it on, to avoid having to get out and clean the spray gun.
Shellac is probably the fastest/easiest/least toxic/cheapest/most forgiving/best looking/do i need to go on?/ sealer out there. I am talking about shellac mixed from flakes or zinssers 100% wax free universal sealer, which is just shellac and alchohol.
I have sprayed a whole lot of KTM-9, and i really like it. However, the latest batch of target waterbased lacquers -oxford USL and emtech EM6000, are basically, "better" than KTM-9 in most ways, mainly they are easier to spray without runs, and much easier to rub out. If you already have some KTM-9, or if you are just commited to it for some other reason, there is absolutely nothing wrong with it, and it can give you a great finish.
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