Here's link. Scroll down and you'll see how to make it. I would just add a little bit, let it melt the abs, then add more, mix, add, mix, etc until have a good mixture. You don't want it to runny so the acetone doesn't melt surrounding material on your armor
http://www.whitearmor.net/forum/topic/2041-howto-make-your-own-abs-repair-paste/