If you mean sprays for multiplayer games, then the maximum size of a spray is
256 X 256. Using anything higher will force the image to srink and it will lost its quality. So it is suggested to use a 256 X 256 canvas.
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no because garrys mod requires that you have a game that uses the source engine
gmod is 10$ at garrysmod.com
You have to build one.
No. it is PC only.
To get in a seat/car in garrys mod you must press your use key next to it (default is E). If you do not know what your use key is go to options and check in keyboard.