I had a little boo boo when I painted my arm reset and I want to completely strip the paint off before the 2nd go around. What should I use so I don't damage the vinyl???

try some thinner

Avoid products containingAcetone since that will degrade/damageplastic (vinyl).

Products containing Isopropyl Alcohol will not degrade/damageit. Or use straight Isopropyl Alcohol,pour it on to a cloth/rag and use in a well-ventilatedarea at room temperature. It will not leave a residue after it oxydizes (dries) either...but it may takea couple of"clean areas" on the rag to get it all cleaned-up.Depending on the amount of paintneeded to remove, it may take some time and scrubbing to remove the material.

Hope this helps!