The answer is yes; you could mix interior and exterior paints. However, the exterior paint has a much higher amount of VOCs in its mixture, which could harm you when used indoors.
How To Paint Porch Railings – Ace Hardware
Wall planks Wood shade painting DIY Asian paints
How to mix paint
Frequently Asked Questions
What happens if I mix interior and exterior paint?
When you mix different types of paint together, you are reducing the effectiveness of each of the specific paints. For example, if you mix interior paint with exterior paint and use it outdoors, you will degrade the durability of the exterior paint, and it probably will not last as long as you would like.
Can you make interior paint into outdoor paint?
If you wish to apply an interior paint over an exterior paint, the quick answer is yes; the long answer is…why? Applying interior paint over an exterior one requires surface prep work and the use of a primer if it's water-based over oil-based paint.
Can I use interior paint outside as a primer?
Flat interior paint works as a primer and can be painted over with the correct exterior paint. If the interior paint is peeling all bets are off and you need to remove the peeling paint, scuff sand and then use a bonding primer before you apply the exterior paint.
What kind of paint should I use for interior paint?
Very simple, interior paint is for INSIDE, Exterior is for OUTSIDE. Used latex over latex and oil over oil. If you must change oil to latex SAND AND PRIME. BV020516