You need a proper 3 stage filter set comprising of a pre filter, coalescing filter and carbon filter, the carbon one is usually in the airfed mask belt pack. I wouldn't paint 2k without airfed not worth the risk. You can couple 2 compressors if you can borrow one, but if only doing a one off job best to just use 1k paint, I have experimented with iso free 2k primer and it works fine, used standard solvent base coat and upol 1k smart clear not as good as 2k but safer and plenty good enough and reasonably hard wearing.