I have oily skin and if you don't use primer every day like me, the travel size of the smashbox photo finish has literally lasted me years and it's only $15, which if I recall correctly isn't much more expensive than some drugstore brands.
I have heard a lot of good things about using a thin layer of milk of magnesia.
What's this for? It's a wig.
What's it for? To disguise yourself from yourself.
So what's it going to be then, eh?
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