So far we have shown how to powder coat flat surfaces but inevitably we want to do a dome or concave shape, we are artist after all and the world still isn't flat. So this post will be about a technique called hot coating, essentially heating the piece up and applying the powder coat. Odd shapes are coated with a static gun everyday, the benefit of charged particles and static attraction. But then we get into the expenses of compressors and guns and we're trying to keep this as simple and minimal as possible. So hang on here we go.
Our first picture is of a dome that has been coated and then placed into the oven, but in placing it in the oven much of the coat slipped off and well one of these days we'll have to post a photo of the inside of our poor colorful oven. The dome turned out very spotty and without a nice even coat. To solve this we're going to put the pieces in the oven to heat them up and then sift powder coat over them and let it flow / melt.
Starting with a few different shapes so we can test steep sides verses shallow domes we place the 4 test subjects in the oven. Wet Black is used in this example and it cures at 400 degrees so we set the oven to the cure temp and set the timer to roughly 5 to 10 minutes, just enough to heat them up.
Once we hear the happy ding of our timer we use tweezers to move the pieces over to where were coating and place them on some screen. These are hot so don't place them on anything that can't take the heat. We take the sifter with powder coat and sprinkle the coat around the edges and working towards the center till an even coat is applied. Since these are small and easy to coat quickly we did them all at once but if your doing several or just playing around at first you can leave the extras in the oven to keep them warm while you do each piece individually.
Once a even coat is applied, we let the pieces cool so we can place them back in the oven without marring the surface with tweezers marks. Now that all the pieces are ready for the final cure we set our timer for the cure time plus a few minutes for them to heat up again and let them cure. Here's our four pieces after the oven cure is finished.
Alternative Methods;
Using a small crafter heat gun we have been able to heat the pieces quickly and apply the coat. The problems are guessing what the temp of the piece is so it is more of a trail and error process. Also you are heating up the surface below it allowing the powder coat to stick to it also. Remember a clean shop and tools make for easier work or so Amy keeps telling me.
We've also tried a small butane torch but ended up with oxidation, fire scale, on the pieces before we could coat them so torches aren't the best for this technique.
Keep your oven door closed, A&J
We've just posted a few new items to our shop that will add lots of color to your jewelry projects. 1 inch and 7/8 inch discs with powder coat on both sides. These are made with Aluminum so they are very light to wear making them perfect to add lots of color to a piece without making the piece to heavy.
Hello again from the the other half of Toaster Oven Art.
Starting with a few different shapes so we can test steep sides verses shallow domes we place the 4 test subjects in the oven. Wet Black is used in this example and it cures at 400 degrees so we set the oven to the cure temp and set the timer to roughly 5 to 10 minutes, just enough to heat them up.
Once we hear the happy ding of our timer we use tweezers to move the pieces over to where were coating and place them on some screen. These are hot so don't place them on anything that can't take the heat. We take the sifter with powder coat and sprinkle the coat around the edges and working towards the center till an even coat is applied. Since these are small and easy to coat quickly we did them all at once but if your doing several or just playing around at first you can leave the extras in the oven to keep them warm while you do each piece individually.
Once a even coat is applied, we let the pieces cool so we can place them back in the oven without marring the surface with tweezers marks. Now that all the pieces are ready for the final cure we set our timer for the cure time plus a few minutes for them to heat up again and let them cure. Here's our four pieces after the oven cure is finished.
We've said that our attempts at enameling lead us to working with powder coat and to that end the first photos shows several pieces with Cloisonné wire. We even used the Cloisonné glue for the wires with no effect to the powder coat, just be sure to dry the glue or bubbles will appear when curing. We used a copper wire to create the designs and then clear coated the pieces for a nice shiny effect.
We brought out the disk cutter and dapping block for the second photo and all these pieces are made of 22 gauge aluminum. We used the dapping block to create the domes and then polished them up nicely, then applied powder coat to the background disk, flowed it and applied the top domes and cured them using the powder coat to glue the pieces together. The flatter pieces again are two pieces where we applied the powder coat to each, flowed them and put them to together and cured them. These pieces also have the clear coat applied to them as a second coat after curing the first coat.
I like the effect of the excess powder, (kind of a snowstorm look) but I still would like to get a clean image with no excess, so the experimentation will continue. 
Flow Out: The piece is left in the oven a bit longer till the powder melts completely and begins to flow.
To add the red we simply covered half of the metal square with a business card (LBbyJ of course) sifted the powder on to it and removed the card leaving half red / half white. We have used a corrugated metal piece here to make it easier to pick the piece up with tweezers and wax paper so we can reuse the excess powder.
Antique Pink
Signal Green