respirator????

havn't painted in 20 yrs. I 've been told I have problem with the isocynanides in the paint. going to g=have to do some of this myself. can't afford fresh air system. lookin for info as to the best respirator to use. self etch epoxy, 2k primer, single stage urethane or maybe 2k ?????. it will be pretty done pretty well open air shed.