The enamel might have been to thick, or it might have cooled to rapidly, or the metal might have been to dirty from fingerprints or grease, if your using klear fire you might not have waited long enough for the klear fire to dry, you can realy take your pick when it comes to enamels. My advice is to pickle your peice , or clean it very well with pumic or comet. If you don't want to wait for your klear fire to dry then use squeege oil, it produces black soot when it burns but can be put in the kiln immediately. Then sift your enamel on your peice and cross your fingers. It will be all lumpy but you just stone it off after its finished firing and then fire it one more time to get your gloss back. Hope this was helpfull, Frank