Cheers Artcore you are a star. Your Marines are looking great, always nice to see more Ultras!
And I really like your Rhino, good job on the Tactical Arrow on top, I hated painting mine. I didn't think to use tape, I drew mine on in pencil with a ruler, but may try tape next time as I have another couple of Rhinos to do.
As for weathering I tend not to do too much on my vehicles as its very easy to go over the top, but a little bit here and there never hurts.
For my battle damage I apply a darker shade of my main colour to areas I feel would be most likely to get chipped, such as corners or areas close to the ground. Around hinges or regularly used parts also makes sense.
This darker shade (in the case of my Ultras I used Regal Blue) represents the tanks primer, which is normally painted on before the vehicle itself is sprayed. However a lot of people also use grey for this (codex grey would be good) as a lot of vehicled in real life are grey primed.
Once all this is done I then repaint some of these areas in boltgun metal to represent damage which has gone right through to the metal work. I then apply a bit of Badab Black over this to blend it all in and tone down the metallic. I swear by Badab Black over Boltgun metal, it makes painting metallic areas really easy.
For rust I stipple areas in scorched brown and then re stipple in Bestial Brown as this is a nice orangey brown.
And for mud and dust I lightly drybrush areas in graveyard earth and scorched brown. Dried mud tends to be a lighter colour so I use Graveyard earth for this, and fresh mud is a bit darker so for this I use Scorched brown (although you should mix a bit of the two together to give a more graduated finish).
Hope that helps. You could also buy some weathering sticks (My mate uses tamiya ones which seem ok) or some weathering pigments (MIG Pigments are best) which you should be able to buy from a good model shop.
OK so I have also been painting more Ultras, but have unfortunately fallen a bit behind so only have an almost cpmpleted assault Squad to show.
Again apologies for a WIP photo, I promise to get some new pics when I have the camera again.
These are about 90% finished, but I need to go back and sort out a couple of bits as I feel like I rushed these. But I am very happy with them nevertheless, but never want to paint another Jump Pack for as long as I live, I don't know why but I just didn't enjoy them.
Cheers for looking.