The following tips and hints were posted on the Yahoo! Metal Clay Group by Linda at Laughing Girl Arts
Heat the jar of resin before use. I find it too thick to flow easily right out of the jar but when I heat it it liquifies and flows easier. I put the open jar on my mug warmer with the lid sitting lightly on top to block light and stir it every 30-60 seconds until it feels loose. When it gets where I want it, somewhere between "doesn't flow" and "runs off the toothpick before I can get it to the piece", I turn the mug warmer off and let the jar sit there as I work. Reheat as needed.
I use a toothpick or bamboo skewer to pick up a blob of resin from the jar and then drop onto my piece. The blob stays attached to my skewer until I touch it down on the piece. You may need to coax the resin to the edges of your piece with your toothpick. Be sure to wipe up any threads or spills as they will harden on the piece too.
Remember light cures it so don't leave the lid off the jar very long if you're working in bright light.
I'm afraid of undercured resin so I usually give it two rounds of time under my auto-shutoff manicure lamp just to be sure. Probably not necessary but it eases my mind. That works fine for transparent colors too. I haven't done opaques.
I put the bottom of a cardboard shoebox upside down over the manicure light so that the UV light doesn't leak out. And I try not to look at it when it's on. Bad for your eyes.
Don't let the sticky residue on the top of the cured resin throw you. It comes off perfectly with just a swipe of the UV Resin cleaner. Conversely, if you're doing multiple layers you don't need to clean off the sticky residue between layers. It is really sticky though so don't get dust in it between layers.