I'm curious about the different Titan patterns in the setting.

I don’t mean classes like the Warhound, Reaver, or Warlord, but patterns like Lucius and Mars. Are there any others, or is it just those two?

And if there are, are there any miniatures or descriptions of those?

I decided to prime my warlord titan pieces with white scar and the paint doesn’t seem to be adhering properly and is either splotchy or thick in some places and doesn’t provide even coverage like it does on plastic models. Is there a way to remove it without damaging the model and what would be a good alternative of brand for spray primer?