I've also used Citadel paints on other models, also with good results.

The trick is to make sure the model is dry and free of uncured resin.  for best results I usually let the model dry and cure for a few days before I attempt to paint it.

How well do the form1 resins take paint? I was curious but it doesn't seem like you had way too much trouble.

The only way to get the model from the site is to place an order with their services. 

could you recommend me 3D printable Warhammer models and hook me up with a link so I can get them?

Here is a link for you:
https://free3d.com/3d-models/warhammer

could you recommend me 3D printable Warhammer models and hook me up with a link so I can get them?

Now that’s a kick ass paint job. Its not just the paint job, the whole project is pretty sweet. I myself found the model https://www.treatstock.com/3d-printable … shi-mk-iii from "Mechs" universe but will try to paint it in Ultramarine style.

Can you download the model, or is the only option to have someone print it for you?

BTW, that mech is not a Warhammer mech.  If you're looking for Warhammer models, there are some available on line.  Some are decent, some no so much, and then there are some that are super detailed, but cost quite a bit of money.

I for one, started by downloading some of those, but found I wanted to have more control of the details, poses, etc. so I started doing my own. 

For the larger mecha I modeled my own based on the actual Warhammer model like the one above. 

For the marines I got access to some low-res models extracted from games like WH40K:Space Marine.  These models are fully rigged (posable), and look good because of detailed textures, but the actual geometry is pretty basic, so I first pose it like I want it, then export it as an STL, and use MeshMixer to smooth it and add details.

It looks pretty good, except the seams between the glass panes are a bit distracting.

Anyway,  I added a couple Ultramarines to keep him company, and a bit of terrain, grass, rock, lichens to complete the diorama.

Here it is what it looks like under the glass dome.