I do it with a split cup. I glued a partition in the middle of one of my pyrex cups. I warm up the cup on a hot plate then pour different colors into the sections. I hold the cup as high above the mold as possible and still hit the hole. I pour the smallest stream that I can which allows the plastic to swirl.
The hardest part is making the cup. I used some aluminum flashing and glued it in with JB Weld. I've not had many colors that looked very good unless one of them was white.
We discussed this once before. Just be sure not to use the regular JB Weld. It will stay forever. Since that discussion I have used the epoxy putty to get rid of some collars. It seems to be working just fine. (Thanks to smalljaw.)
We used carpet knife blades fastened together. We put them in a vise and placed the tube tail on top. Then we used a dowel rod and rolled it over the tube to cut the tail.
It was a pain so I bought some injectors.
The reason I asked is I dipped in the past and now inject. I never use hardner as I want my tubes to be as soft as possible hoping the bass will really hang on to them.
I don't mind if they tear because I can always remelt them.
After you've done some research, If you don't have a plan then you might want to consider some starter kits from some of the places like Bear's, Jann's or Barlow's.
I have been using powder paint on some jigging spoons. I want to try something else.
What is a good type of paint I can use that sticks well and where can I buy a few colors?
You bet. I have a couple of bottles on my work bench. Lately I have been using Krazy glue for some of my coats since $ GEN now has it in bottles with brushes.
I see no need for weedguard in swim jigs so I leave them out unless I am swimming them in and around brush. Then I like the 90# steel leader like I put on my tube jig heads.