It'll go brittle & deteriate if not painted. We used MUPVC for years & it was great, but moved over to ABS - which is not so good & can discolour very quickly.
Previous owners of my home had sink and washing machine waste going straight outside and into the drains; both of them had become brittle and fell apart when touched -the latter was only a few years old. I glossed the replacement pipe.
Most push fit/compression fittings/pipe are less UV stable that solvent weld and don't do well outside over time IME. Solvent weld (MuPVC/ABS) would be my material of choice for external pipe runs. Black seems to more resistant due to the carbon additives.
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