I've spent a few hours on my hammerheads this week, I added some "shark's teeth" hanging on the right shoulderpad - made out of combat daggers! I was pretty excited to try the painting the camo so I haven't had much trouble staying motivated to work on these guys.
Picked up some art masking fluid from a craft store (it's meant for watercolours, but works great - by
winsor & newton) and have been giving it a go. I did one whole model through to see how it looked, so in the end I decided instead of batching the rest, to get one at each 'major' stage through the process, to give you a mini guide.
Some background. I wanted the grey for the camouflage stripes to match the grey of my other
Space Sharks. So I decided I would do the armour the same, and use a mask to protect the camo pattern, painting the yellow overtop. I did this to hopefully keep them more closely visually linked with the 4th company sharks.
WARNING: This stuff will
RUIN your brushes, not even good as a drybrush. I ended up switching to using a toothpick/paperclip to apply it, if you do use an old brush - wash it after
each dip. Dip, paint, wash, dip. Trust me.
First, here's a group shot for me to list the major steps.

Left to right;
- prime med sea grey, black wash, light grey drybrush, boltgun metal drybrush.
- paint over tubing and apply camo pattern with art masking fluid.
- iyanden darksun, gryphonne sepia wash, drybrush golden yellow.
- use an eraser, toothpick, etc. to scratch off the art masking fluid. clean using a dry brush.
- painting details, decals, etc.
Here's a close up of the guy with the art masking fluid applied. I got the kind with a bit of tint to see it more easily, so you can kind of make it out. Wherever there's a yellowish tinge.

Here's a close up of the guy with the art masking fluid scratched off. I have a couple little fixes to do, but nothing drastic. Note: by this time I was using a paper clip to apply the art masking fluid.

Here's the guy who I completed first to sort out colours, etc. from all four sides.

I really like the masking fluid. Another thought I had to use it with would be for difficult quartered/halved patterns (
Novamarines anyone?). If you have any great ideas please let me know.
ps. the space sharks have just surpased the novamarines for chapter tagged the most.