I've tired searching online before and failed to find a sensible supplier of art latex. Anyone ordered some and used it effectively for diy brew sealant?

Cheers

Well it's been in for a couple of months ( as a top up)you can see where the thorns have been by a slightly moist (i love that word) spot on the tyres after a ride so i've no complaints so far, tyres are Conti mountain kings -rear is proper tubeless tyre and the front is a supersonic with that hot chillie compound (bloke in the shop reckoned I'd never get it to work,red rag to a bull that one)I got the latex from a local art/craft suppliers (hussey & greaves in chelmsford) £11 per litre & I used it without any thickener

What's the best home brew sealant recipe? I need to make some, but have always bought sealant before. As I seem to get through a lot, could do with making some.