alright spunk!
right. basically standard cpi general purpose is 2 coat gear. euromix have a one coat that is basically mono and is coloured. thats designed for scraping
iv used a fair bit of general, and one coat once. the one coat is nice gear and sprays well, really fine finish but takes forever to set. in warm wether it was still wet in the afternoon and i had to finish in the morning
with the general purpose, i used to always use it as you would site mix, scratch and then top a few days later. iv used it like an ocr a few times now tho and havent had any problems. the euromix rep for my area said unofficially that it can be used as an ocr in the right circumstances but they wont cover you if it fucks up. i only used it as an ocr on 2 jobs. one in london which was a big curved wall on a round building. it was nov/dec time and it was really cold and on new blockwork. i ended up first thing doing a tightish pass, then giving it a rough flatten off and going straight back over it. it just about floated by 4. came out really nice tho. capital spread helped me out on that one. he'll be able to back me up on that. i also had an elevation there, about 20-30m, and i was getting a bit pushed for time on the job. i sprayed that one evening and left it like you would mono, and in the morn about 7 i sectioned and misted with water and floated and then sponged. it worked but i wouldnt recommend it as an hour later id have been screwed i think. but the i sectioned finish would have looked alright if i was allowed to leave it like that.
on the job i did with grump, we 2 coated as it was on mixed backgrounds. on the new blockwork i used it as an ocr again as it was my last job b4 i left. again on that i just put a tight pass over, quick flatten and a cup of tea then topped it. it was pretty warm and we were floated by 2ish. again looked nice and no probs or callbacks. i reckon you could do it with site mix too tbh on small areas. just a tightish one, let it pull so it wont slump then top it and float. blocks dont show through and its painted anyway. but yeah you do have to fill out your bells a lot