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I have an older Crisis Suit Commander model(circa 2001) that came with the Crisis Suit sprue and then a few extra metal bits. When gluing metal to a plastic model should I use super glue or the regular model glue from Citadel?

The other question would be about undercoating. Will the undercoat come out looking any different on the different surfaces? I would guess not, but I have never used metal for models before so I just want to be sure. Thank you for any help you can provide!

Plastic to metal parts need superglue as poly cement (or whatever gw are calling theirs these days) works by effectively melting two plastic components into each other.

Can't see there being a difference with the undercoats, my old ork stormboys for example never had a problem with that

Yup, you want Super Glue for that action. I'd also recommend pinning the metal piece too, almost regardless of size. The undercoat will be the same though, no worries there.

Thank you both!

And be sure to sand/file the joining area nice and flat. Shouldn't be a problem after that. The key is a flat-to-flat surface area.

I would also go as far as washing the metal bits so it gets rid of the mold release and makes a better bond on the plastic.
Do not forget to score each piece where they will be glued so the glue makes a stronger bond.
I might even go as far as to use a bit of JB Weld 2 part epoxy to make sure the pieces are together forever.

I've heard that a little bit of greenstuff in between the jounts helps, the superglue has a chemical reaction with it that makes it hard like epoxy.

^^ ONLY the surface of the GS. The superglue won't penetrate INTO the GS.
The GS itself (at 50/50 mix, never cures fully rigid) and that slight springiness acts as a sort of shock-absorber for the joint, though.

KINGPIN54 wrote:
I've heard that a little bit of greenstuff in between the jounts helps, the superglue has a chemical reaction with it that makes it hard like epoxy.

It's not a chemical reaction. Superglue likes flush joints with no gaps, any gaps become weak spots in superglue, greenstuff fills the gaps and is much tougher, while the superglue holds it all together as the GS cures.

Gluing metal to plastic, it depends on the part, sometimes I use superglue, sometimes epoxy, sometimes pin it.

The undercoat possibly will look a bit different on the metal parts to the plastic parts if you apply it thinly, the same as it might look different on different coloured plastics. It just depends how thick you apply it and how good coverage the primer and undercoat has.