I’m making a jet model but then when I add a material, the material doesnt seem to do anything to the model.
Are you in solid view, or material preview, or render? Press Z to switch between them.
How are you “adding” the material? If you’ve just made a material in the Shader Editor, there’s a chance it’s not attached to the right object. You can assign materials to an object with this drop-down in the Properties Editor:
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I restarted my blender and now it is working. Sorry!
No worries 
I’m glad to hear you got it working!
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