My posts are all GorkaMorka models and yes they are 28mm. I have been using the dip on them, and love how they come out I just need to get some dull coat to knock down the shine.
My current motor pool. I have two old school battle wagons.
Rokket buggy WIP
Trukk needs dull coat
Trukk pre dip
Two buggies with dip need dull coat
All three of my buggies
My kit bashed bikes, they need dull the most of all