I bought a box of assault marines from an ebay seller. The kit is fine, but really showing its age in terms of finish. Compared to the new Space Marine Tactical Squad set the details are a lot less defined. Particularly the legs, where the knee pads meet the thigh armour. This is not a complaint so much as an observation. I still like the kit.
However, the jump packs really do have big gaps. I didn’t take any pictures while I was assembling mine. It’s a bit of a bother to set everything up. But, here is a good example:
This picture comes from an excellent OSL tutorial from ChestofColors.com, which can be read here. You can see the gaps quite clearly. You can also see how inaccessible those parts of the model are. When I painted my Chaplain, I tried to sand the seams smooth. It didn’t work very well and I was unsatisfied with the results.
I have some green stuff but I’ve never used it before and it seems like an unsuitable application for it. I did some research on filling gaps and decided on Vallejo Plastic Putty. It’s water soluble so it won’t wreck your brushes and can apparently be colored with paint. It comes in a dropper bottle or tube. I bought the latter.
I found it really easy to use. I simply applied it into gaps with a paintbrush and used a damp cotton bud to remove the excess. I then sanded the surface with sanding sticks, then some really fine grit sandpaper and finally burnished it with my nail. I find a soft bristled toothbrush helps polish the surface too. Here are the results:
It’s impossible to tell how smooth the surface is until it’s been primed. Grey primer really seems to show any imperfections up. That said, I’m very pleased with the results. I was able to fill even the tiny gaps inside the thrusters. The putty sanded well and didn’t seem to shrink much as it dried. I’m not sure if that would be the case with bigger gaps though. I guess green stuff might be a better alternative in that case.
The only niggle was on the underside of the Jump Pack, in the middle, under the vent. I was able to apply the putty just fine, to what was a pretty sizeable gap. But I found it very difficult to sand or scrape away the excess. If I had some of the cotton bubs that end in a hard point that might have worked better.
I won’t be magnetizing the jump packs. I don’t see much point in Assault Marines unless they have them. Eventually, I may decide to upgrade to a Space Marine Bike Squad. I really like the models and they seem like they’d be a solid choice in a game.