I used Acrylic paint with a sealant to protect from water.
Also, Welcome to the Ranks of the Order! Good Bruder Edvard has the GDFB stuff and it looks to be of good quality. Fits a 13th century persona perfectly. I'm in the 14th century, 1330-60, so I"m going with another custom job from BJ, who is responsible for my other garb.