I can see why you don't want to use powder paint. When the weed guard gets hot it starts to fray and melt. You can tape up the fibers and it won't fray apart. Powder paint is the best way to go through. Quick and easy, one coat will do it.
Another method to use is epoxy paint. Lure Craft (if it is still in business) makes some great epoxy paint. This is what I used when I made lures for my business. Then the powder paint came along and I haven't looked back.
I painted my own weedless bass jigs with epoxy so the hook eye wouldn't get plugged up with paint.
If you use powder paint you must use a system to hold the jigs up in the air so the paint runs down the hook and not deform the jig head. A wooden row of posts sticking up with alligator clips on the end works. I made 1000 spinnerbaits and buzzbaits a week using this system. My living rubber skirts were all hand tied...no pre-made or silicone skirts in those days. I increased my production by 5x when powder paint came out. Good for spinnerbaits and buzzbaits, but not weedless bass jigs with fiber guard weed guards. Those still had to be hand painted. While the spinner and buzz baits were cooking, I painted the jigs.