Ok so basically, I was trying to make a train, but when I unioned all the parts, the material for all the parts in the union, was set back to plastic. Also, when I union things, I can’t change the color.
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In order to change the Color of the union you’ll need to go to properties and enable “UsePartColor”.
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ok thanks! What about the material?
I’m not quite sure about the material, I’ve never had that happen to me myself… 
So basically, if I had two parts, one part’s material, cobblestone, and the other, glass, if I union them, the material for both of the parts sets back to plastic, also, the transparency is set to 0 again
Did you union the train to make it all 1 Part?
Yes (30 charactersssssssssssss)
I think the problem is that you can’t have multiple materials on 1 part.
Ya I think you can’t union parts with different materials from my experience
So it just changes all the parts to plastic?
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Just don’t union them just make two separate things. Weld them if u need to
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Union only use one material. Consider using group and weld for making bigger model
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You can’t use more then 1 texture in 1 union. Consider to make more then 1 union and union the parts wich are the same color/texture.