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Lately, whenever I paint I notice a lot of little lumps of stuff ending on my models...

This happens most whenever I paint Metal Colors

I am using GW and Vallejo Paints...

I've searched on google but couldn't really find this problem...

Also, should I do thinner multilayers or just one thick layer of paint?

I am new to painting these miniatures so not really skilled or anything...

Thanks~

Thinner multi-layers - this helps a lot.

I use both gw and vallejo (and reaper, etc.) and while I have not seen this yet, I have heard of it before.

some pics would help but it might be down to a few things

dirty water, be sure to change your water each time you paint
too thick layers, water them down and use multiple thin layers
bits of dry paint in your paint, no real cure :3

Sounds like you have some dried lumps of paint in there

metalic colors also dry much much faster than normal paint. You may wish to considder drybrushing instead of painting directly.

The lumps sound like chunks of paint that dried around the lip of the pot/tip of the nozzle, then fell back in and got picked up when you went to paint. I get these, occasionally, but when I thin the paint on my palette they're pretty easy to spot, so I just push them aside or pick them up with the brush and rinse it off before I load up with paint again. Their existence is unavoidable, but it's not difficult to keep them off your models.

More generally, multiple thinned coats is the preferred method.

If you are using GW are you painting straight from the pot and leaving the lid open?

If you are using Vellejo are you thinning your paints?

You never want to paint straight from the pot, this leads to thick chunky paint jobs. Also, let your first layer dry before you paint another layer. If you are putting your next layer on to soon this will cause the wet paint to mix with the dry paint on the top and give you that chunky look.