MrMiles Posted June 14, 2023 Share Posted June 14, 2023 I just received a new sealed amt kit of a 67 mustang fastback. However there is one entire tree that has yellowed. Has anyone seen this before. Is this something I should try to have amt replace or do you think it's ok Quote Link to comment Share on other sites More sharing options...
Dave Van Posted June 14, 2023 Share Posted June 14, 2023 No telling what plastic the Chinese used. If it's not brittle or super soft I'd think it's OK. 1 Quote Link to comment Share on other sites More sharing options...
charlie8575 Posted June 14, 2023 Share Posted June 14, 2023 I agree with Dave. Take a couple of pieces of the sprue frame, and see if it takes glue acceptably. If it does, you'll probably be okay. I would advise washing all the parts first, though, to make sure it's not mould release or something like that. Charlie Larkin 1 Quote Link to comment Share on other sites More sharing options...
ctruss53 Posted June 14, 2023 Share Posted June 14, 2023 I would not be concerned at all. Just use it. Quote Link to comment Share on other sites More sharing options...
1972coronet Posted June 14, 2023 Share Posted June 14, 2023 9 minutes ago, charlie8575 said: I would advise washing all the parts first, though, to make sure it's not mould release or something like that. That was my first thought : mould release agent. That stuff takes on a Cosmoline appearance when it sits for a while. Quote Link to comment Share on other sites More sharing options...
charlie8575 Posted June 14, 2023 Share Posted June 14, 2023 1 hour ago, 1972coronet said: That was my first thought : mould release agent. That stuff takes on a Cosmoline appearance when it sits for a while. It's not far removed from Cosmoline...or Pam, for that matter. And both will stain with a yellowish color, so even if it's clean, it may be discolored. Keep that in mind. Charlie Larkin 1 Quote Link to comment Share on other sites More sharing options...
peteski Posted June 14, 2023 Share Posted June 14, 2023 Funny thing is that I have heard or read from multiple sources that no mold release agent is used for injection molding polystyrene. Yes, I have seen some amber "stuff' on some model it parts too, but I wonder if it is just some stray lubricating il from the injection molding machine. It would be interesting to see if the yellow cast can be washed off by scrubbing the parts with soft brush and some warm water and dishwashing detergent. Quote Link to comment Share on other sites More sharing options...
Dave G. Posted June 14, 2023 Share Posted June 14, 2023 It could be the last plastic run was yellow and some remnants are left in the lines as this one ran off. Course I have no idea if that's how it even works but if so it might explain the yellow that should be white. 2 Quote Link to comment Share on other sites More sharing options...
Dpate Posted June 17, 2023 Share Posted June 17, 2023 Let it sit in dawn for a few and I bet it’ll get whiter lol Quote Link to comment Share on other sites More sharing options...
CabDriver Posted June 18, 2023 Share Posted June 18, 2023 I’ve had some AMT parts like that from new(ish) released kits…no cause for alarm based on my experience… Quote Link to comment Share on other sites More sharing options...
atomicholiday Posted June 18, 2023 Share Posted June 18, 2023 It's almost certainly just a different batch of plastic. I wouldn't sweat it. As said above, wash it like you normally would and go for it. On 6/14/2023 at 6:15 PM, Dave G. said: It could be the last plastic run was yellow and some remnants are left in the lines as this one ran off. Course I have no idea if that's how it even works but if so it might explain the yellow that should be white. Usually this would come through as a noticeably different colored streak. You know the lines you see in kits molded in different colors other than white? Particularly silver? It would look similar to that, with the streak being the different color. 1 Quote Link to comment Share on other sites More sharing options...
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