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I've just been scrolling through "from the warp" and saw people talking about brush on primers. Could anyone reccomend any brush on primers readily available in the uk? I usually use grey car primer as I find it gives a great base to work from, but to be honest over time the paints are getting thicker and thicker and less usable.

Any help would be awesome. Cheers all.

Regular white gesso worked wonders for me when I wanted to swap my orks arms. I was loathe to paint 300+ boys from scratch, so I just brushed on the gesso (thinned) and let it dry.

I tend to use slightly watered down black gesso.
Spray primers are just too unreliable for me.

Yeah artists gesso is the standard brush on primer,
http://www.artsupplies.co.uk/cat-surface-preparation.htm
liquitex do black, white and clear, and super heavy body.
You probably dont want super heavy as its intended to be thick and almost sculptable like artists heavy body acrylic is.
Windsor and newton also do white cheaper than liquitex
http://www.artsupplies.co.uk/item-galeria-gesso-primer.htm
Ive used the galeria white stuff before, works fine, doesnt actually need thinning. And can be best used with no thinner tbh.
Its 'self shrinking' go ahead, get a bit of sprue and put a gloopy thick layer on it around the writing. When its dry tomorrow itle have shrunk and clung to all the details. to this end its fairly tough to actually destroy the detail on a model with it, which is suprising when you see how thick gesso is out of the tub

edit; one thing to note about gesso is that it doesnt set as hard as automotive primers will do, the surface isnt designed to withstand the hardships of traveling along a dusty road at speed
Gesso is plenty tough for mini's, but wont feel the same as auto primer, its not sandable and wil peel up rather than sand away. Its kind of plasticy, much like acrylic paints are. I have the impression stripping a mini primed in it will become 100% clean much easier than with chemical bonding primers.