a good set up from the start i.e. a bending table and not overheating the conduit, the correct shoe to maintain your radius. Barring that a clean flat surface of concrete, find or make a corner to maintain the 90, a sheet of plywood will work also, wet rags to cool the pvc and patience.For the first time I attempted to bend a 90 with 2" pvc but it kinked up like crazy after removing it from my hot box. I'll just use a premade 90 when I do the job I needed it for, but if you've made a 90 with 2" could you give me any tips, thanks!