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Also asked, what happens if you use interior paint outdoors?
The interior classified products are strictly for interior use only. They lack the heavy duty mildewcide and chemicals that exterior paints contain to withstand rain, snow and heat/cold. They would break down quickly in an exterior environment and would fade and chalk quickly.
Also, is there a difference between interior and exterior paint?
Different paints have different properties, and are formulated for different purposes. Interior paint is made to be scrubbed, resist staining, and allow cleaning. Exterior paints are made to combat against fading and mildew.
Yes, You can mix interior paints into exterior paints but it is important that the paints should be same type.