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Just a question. I've never seen this mentioned in this forum and was wondering if anyone could shed some light on it. while browsing some website I noticed a can of liquid which I thought was just paint but the label said it was undercoat/filler. Am I supposed to be using this stuff? I assume it is supposed to fill small holes etc in minis, I can't say that I've heard of this technique in this forum. So who uses it, what's their opinion of it, and if so what's the best type?

Well tbh I have never heard of it either, but it wouldnt fill in small holes, otherwise it would just kill all the detail on the model, maybe its for getting rid of the release agent on metal and resin models?

i think its for getting rid of the release agent as well.

warm water with soap will do the same

The only time i've heard of something similar was in a historical modelling painting book (large scale figures). Even then the painter used thinned down putty (can't remember what he used:might have been turpentine). The idea was to give a nearly smooth painting surface. The reason I asked about it was that this liquid was advertised on a dedicated wargames website. If only I can remember which!

I recently found an old miniature painting guide with a section on prepping metal minis for paint. They had a lot of very intricate prep work involving sanding, trimming, filing, and filling. The painter actually made a water/Milliput slurry, like potter's slip, which was painted on the model to fill in all of those tiny pits and surface imperfections. The dried result was then lightly sanded again to smooth out any brush marks. This could be a premixed version of this kind of goop.