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How well will the citadel plastic glue work on pieces that have all ready been primed and painted?

Plastic glue won't work on paint at all. You need superglue.

Agreed. Either scratch through the pain job a bit (gotta be plastic on plastic) or grab your superglue.

Thin layers of paint (i.e. overspray, as opposed to a full primer coat) tend to melt along with the plastic, but you'll want to scrape/sand down to bare plastic for a solid join on anything else. Superglue will adhere painted pieces, but you're then relying on the adhesive strength of the paint, as much as the glue, to hold the parts together, which translates to rather weak bonds. I suggest cleaning both of the mating surfaces in either case.

Lordhat wrote:Plastic glue won't work on paint at all. You need superglue.

I dunno about that. It depends. I use plastic glue on painted stuff all the time, it does tend to melt the paint and a thin layer of plastic under it. I do usually just scratch the paint slightly so the glue can reach the plastic. Superglue I would think would be just as questionable, as if you're gluing to paint then the bond is only ever going to bee as strong as the paint is attached to the model, and using acrylics that's really not very strong at all. At least plastic glue slightly melts the paint.

Though I qualify my statement by saying I rarely if ever have superglued painted models, I always use plastic glue on plastics and on metals I make damned sure the joint is perfectly clean.

It really just depends on the model. If it's a Space Marine shoulder or head socket or a gaunt shoulder which has a huge contact area and/or socket and very little weight on it, you'll probably get away with it. If it's a Necron shoulder or gaunt head which has tiny contact areas then it probably won't be good enough to glue to the paint and you might have to clean the paint off before gluing.

What I often do when priming models is put a small dab of blutac where the glue will go before spraying the primer so the glue will go on a clean spot. Though admittedly sometimes I get lazy and don't do it and just glue to the primer or scratch the primer off then glue.

Super glue does not hold well on paint, as it just breaks where the paint is in contact with the piece instead of the glue.

Back when I primed on the sprue I would file down the parts that needed to be glued.

super glue only works when bonding plastic to plastic

super glue always works though, and you can try to take a file or knife to remove some paint so you can bond the plastic

Dual Face wrote:plastic glue only works when bonding plastic to plastic

super glue always works though, and you can try to take a file or knife to remove some paint so you can bond the plastic

Fixed that for you.