Q.  Just learning how to pinstripe what brush should I use ?

       Answer.   Mack Series 10 size #0 or #00 blue wrap ferrule.(Don't get it confused with a series 20 green wrapped ferrule. Series 20 is a touch up brush). Series 10 is 100% unmixed blue squirrel hair.Turns very well and will hold enough paint for long lines.Very good brush for beginners or Master striper's    see here

Q.  What should I practice on ?

      Answer.. Get a piece of glass, tape the edges with duct tape for safety. Make a 1" x 1"  grid pattern on the back side with a china marker or 1/8 tape .Pinstripe using these grids.Or make a paper pattern place on back side follow pattern.Wipe off with denatured alcohol and keep on practicing      ( order patterns here)

Q.  Can I clear over one shot ?

     Answer. Yes. Just use One Shot Hardener instead of reducer.. Put hardener in a plastic cup. Pallet paint with hardener instead of reducer. Use with your metallic gold and silver it helps the flow. Or you can also use house of color striping paint and also automotive base coat - (Note):using a base coat to stripe with for clearing is better. It drys fast so you can continue to work without worrying about the wet paint