I tried some powder coating today for the first time. I took two 1/4 oz. worm weights to the shop to experiment with. Here's what I learned:
First, stir your paint (these things I learned will seem mundane to those who already know, but maybe you can offer some guidance or explanations for what I learned). Before starting, I stirred up the white paint to loosen it up. Then I unrolled a paper clip and put a worm weight on it, and bent the wire some so it wouldn't fall off or move around a lot. Then I heated the weight using a lighter for about 20 seconds. Afterwards I just did a quick swish through the paint. WOW! It came out fully coated, glossy looking, and dry within seconds! If I had quit there it would have been a success.
But I was inspired, so I opened the red paint and tapped the container on the counter to loosen it up. I was just going to dip the tip of the weight to basically make it mostly white with a red tip. I heated the end of the weight with the lighter for just a few seconds, not wanting to blacken the white paint, and then plunged the weight into the red powder. That was mistake number two, as I had already made mistake number one but didn't know it until then. I didn't think stirring the paint was needed since I had shook and tapped the red powder prior to use. The lead weight just stuck into the powder much like it might have if just plunged into dirt in the ground outside. Afterwards I stirred the paint, and tried again. This time it was loose, but I wasn't getting the same nice, glossy results with the red. It was drying flat and grainy looking on the end of the sinker, and also leaving pinkish looking areas from where the red powder had not fully coated the white below it.
So I followed this with a whole series of mistakes. I heated and reheated the sinker repeatedly, and plunged it several times. I was trying to get a very distinct white to red edge on it. But I would get a powdery looking transition from one color to the other instead, and not evenly coated either. It was always grainy looking each time as well, and I figured it was because I hadn't gotten the tip hot enough to fully activate the paint to melt and bond well. I was afraid to hold it in or over the flame too long or it would ruin the white paint by browning or graying it, which it did in some places. I also noticed the sinker's conical tip was getting fatter from all the dipping and having paint build up. It was changing the overall taper of the weight which was something I did not want. Finally I decided to just dip the whole thing and make it all red. That worked but only moderately well. It was flat and grainy finished so I started heating and rolling the weight over the flame to smooth it out. It did get glossier as I did this but not like that white had been before. So I laid it aside and tried the second weight.
I simply repeated my first attempt at just making an all white weight. It came out not so well since my lighter was low on fluid by now so I didn't heat the weight more than a few seconds and the paint left places that were thin and I could see a darkened spot on one side as the lead showed through. So I attempted to reheated it for a second swish. This worked but also caked the paint on and left a grainy look (again, not enough heat?), so I began rolling the weight over the flame to smooth it out. This worked with limited success. It seemed the paint would begin to run slightly and form heavier spots leaving a lumpy look to the finished surface, like yogurt in a cup. Also, the paint had hardened on the tip and bonded the weight to the wire shaft. When I twisted it on the shaft to remove it I got paint chips on the tip.
Not knowing what to expect at all before this, I'm trying to not let this discourage me. My first swish was flawless and I think it's because I stirred the paint, heated the weight nice and hot, and just made a quick 1/2 second long pass through the loosened paint. Where I went wrong was not knowing how to reapply enough heat to the already painted weight the second time in order to add more color without scorching occurring. Also, not stirring the red paint before use, and all the dipping and redipping again and again that built up paint and actually changed the look and shape of the worm weight. The second weight didn't go as planned due to not enough heat even for the first pass and then repeating this again without enough heat so paint just caked on (wouldn't tap off either, I tried), and then trying to fix it by rolling it over the low flame.
I read Cadman's tutorial on applying secondary colors using a brush to just tap and let the paint fall onto the heated surface. I did not try this as I had thought it would leave a sprinkled on appearance and I had wanted a very distinct white and red field on the weight with no transition, just two solid colors meeting in the middle. Was there any good way to achieve this?
I plan to keep trying. I only spent about ten minutes to do all this as it was. It's all the time I had for it at the moment, so I just wanted to squeeze it in. Also, a fluid bed is in my future. I'll likely mess up a lot of sinkers learning this though. As of now, I have no way to bake them after painting, but I'm just trying to get the coating part right for now. The paint seems hard when dried but I know it's brittle because of the chipping I got when it bonded both lead weight and wire together and I twisted them apart and got chip out. I think next time I try this, it will be just to do some solid coats on one pass so I build confidence. I feel I can do that fairly well based on my very first dip. I might also try mixing some colors, as I have now bought all four of Harbor Freight's colors they have available, white, red, yellow, and matte black. I think I should be able to make gray, pink, and orange with these also. I need to find some blue from somewhere to mix any other colors.