Rough/sandpapery feel to spray paint

I thoroughly cleaned, sanded, and wiped down my old metal lawn chairs. I primed them with Rustoleum primer then painted with Rustoleum gloss spray paint. They felt rough/sandpapery. I did this outdoors, so I sanded, washed, and tack rag wiped them down, brought them indoors, let them dry thoroughly, and gave another coat of spray paint (Rustoleum gloss...Seaside --lid says "new color"). No primer this time. First coat looked great. I went back in an hour like the can says to do and gave a 2nd coat. The second coat went on rough, just like what I had sanded off. What's going on here? I've never had this problem before!