I haven't used the spray cans of Kilz. But I have used the big brush on
cans during construction work. I can honestly tell you, if the can
stuff smells anything like the brush-on stuff... AVOID IT LIKE THE
PLAQUE, the smell is so strong I thought I'd die before I finished
painting the bathroom ceiling.
Actually Kilz has other chemicals in it that you don't need to mix on a
model kit, unless you'll be playing with it in the bathtub often? It's
meant for covering over tough stains and mildew that regular paint
won't cover up even with multiple coats.
Take a walk down the spray paint isle of Wal*Mart, there's plenty of
better options to chose from and all for under $5.00. There's even some
in the automotive area too.
I think Krylon even has spray cans of acrylic paints.