It is hard to describe the blotches, but they look almost like water spots.. like a pool of water that dried up. I did shake well and heat the can but it is possible that I did not shake long enough. I will check that out, I have 4 cans left. I used to have a spray booth at my last home and mixed my own automotive clear coatings using a flattening agent.. a milky white material that cut the gloss. My cowl has milky white areas on it and I painted it last. I remember rattling the can but not sure how long so that could be the problem. I will do some tests

I did discover that the krylon paints are not going to work well around alcohal as I had some some color on the clear canopy where I missed masking. It only took a q-tip and 5 minutes of rubbing to completely remove the paint using rubbing alcolhal. (no pun inte