I'm getting ready to get a riser dipped also. Here's who I have found.
hydro-dip.com
tarjac.com
liquidcamo.com
h2oimaging.com
northwesthydroprint.com
o-hg.net
wedipit.com
dipdoctors.com
colorandcamo.com
camo-solutions.com
I'm not sure who I'm using yet, but take a look.
CP