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I just washed my Ta'unar's pieces in warm soapy water and scrubbed with an old brush but the 3 largest pieces (the guns on top) are still shiny and oily feeling. I let them sit for about 20 minutes for this. Should I let them sit in soapy water over night or something?

What kind of soap did you use? Degreasing dish soap should do the trick, if not, a soak could help, yes.
I've not heard of FW being excessively oily, sorry for your struggles.

I'm using some Dawn Ultra, says it's good against grease. I guess the pieces aren't too oily, just shiny and feels like there's something covering it that's softer and more rubbery than what the other cleaned pieces feel like

Some FW stuff I've had has had very slick shiny surfaces. If ever I'm worried about paint not sticking I usually just give it a light sand with some reasonably fine grit sand paper (fine enough not to leave scratches when you paint over it, not so fine that it just polishes the surface).

It sounds heavy handed, but I use a brass wire brush.

Some of the Ta'unar I painted had a shine to it. Prime stuck great, paint stuck great. YMMV, but you may be unnecessarily concerned.

What primer do you use lechine? I've been using the GW black spray and it's been working great, even though it's not a true primer. Wondering if I should get a real primer for this large of a model though!

I've had this on a few pieces and just put it down to the smoothness in places of the moulds being used.

If ever I get a bit like this, I just abrade it slightly with either some wet n dry paper or a brass brush, or more often than not, just hit it with some matt varnish before I prime it.

Never had any issues with it after doing this.

Hope that helps!

I use one of those nail brushes for all but the smallest pieces (which I use a toothbrush for), and I use a bit of dish soap. The more important aspect, I think is to actually make sure that you cover every little bit with the brush. If you miss a spot, when you prime it, the primer may pool and not adhere properly.

When I first started with FW models, I used to clean, then prep. But because there's a bunch of resin dust after, I started prepping first, then cleaning.

Now, I clean, prep, then clean again, before priming. Mostly, because I'm unlikely to miss the same spot twice, but also because some of the pieces are much easier to scrub when they're still attached to the feed (like heads).

Noctem wrote:
What primer do you use lechine? I've been using the GW black spray and it's been working great, even though it's not a true primer. Wondering if I should get a real primer for this large of a model though!

Army painter black/white/gun metal grey.

It could ether the resin mixed bad or they are now making molds with mirror finished parts.

Usually i use a degreaser like Purple power over night or weeks. but some times the casts are just like that.

you could always sand it slightly like everyone else is saying.

I've found that an application of matte varnish tends to sort out any issues with lingering mould release agent. I now give all my resin stuff a coat , going over any hard to reach places with a brush, even after washing them and I've yet to have primer flake off as a result.