I'm sorry i should of elaborated more.
I haven't been keeping them in the toaster oven, usually what i was doing is heating them over a heat gun for about 10 seconds or so and dipping them in a fluid bed. Nothing crazy, just a quick dip in and out and tap the access off. Then once im done painting the whole run, i load them on the wire hangar in the pre-heated oven and let them sit for 15 minutes.
The reason i said little powder is because i can almost see the lead threw the paint, essentially testing to see if i was doing something wrong.
I am going to go with the toaster oven hotter than i think it is. I just assumed that because it was set at 290 and the heating elements where coming on and off, that it was maintaining roughly that temperature.
I have been using a homemade base but the cups i bought from TJ's. If you can send me your plans id be interested in trying it. At this point, i'm willing to try anything. I will PM you my email address.