I use it a lot, I really like it. I mostly use it through my airbrush, though I prefer the 1200 or 1500 for airbrushing, Like sand paper, a higher number means a smoother finish, but realistically they're all relatively smooth.
It can be used as gap filling but also works great as a primer.
It's quite thick out of the bottle (even the 1500) so I recommend thinning it regardless of whether you intent to hairy brush paint it or airbrush it. I recommend thinning it with Gunze's Self Levelling thinner. Do NOT try thinning it with water, it won't work.
If applying with a hairy brush, you want to thin it down quite a bit and apply it quickly and avoid going over the same area twice, it will shrink down a bit and give a really tough surface finish that subsequent layers of paint will stick to really well.
If using it with an airbrush, just thin it down until it sprays nicely.
If using it as a gap filler, apply it without thinning and just sand it smooth.
It's my go-to airbrush primer and also my go-to small sandable gap filler, far better than liquid greenstuff as a gap filler and far better than Vallejo polyurethane primer as a primer.
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notprop wrote:so great on rough surfaces but probably overkill on smooth plastics.
I don't really use the 1000 much to know how well it works as a general primer, but the 1200 and 1500 varieties work great as a primer on smooth plastics. It has heaps of bite so doesn't scratch off easily but also paints stick to it really well.