I'm gonna start.
Here's my "fine hair sealing" technique for wavy curls. It helps reduce frizz, but if overdone, also relaxes the wave/curl a bit because of the weight of the oil. If you get it just right, it can be curl-and-clump-enhancing and defining.
I use 2-5 drops of oil, spread it well in my palms and especially on the palm-side of my fingers.
1) With my hair damp (lightly squeezed with microfiber towel), I flip my hair forward and smooth my hands over the "underneath" hair. Then I flip back upright and smooth over the canopy. Then I rub my hands to re-distribute the oil and smooth over each side, the canopy in back, and the underside in back like making ponytails with each section. I try to close my hands as I reach the ends so the ends are sure to be sealed. *Could also comb through or finger-comb for less frizz at this point.
2) Re-activate curls: This smoothing tends to pull out some wave. So I spray my hair with water in a spray bottle to get it almost soaking wet again, then re-scrunch with my towel to re-activate the waves and curls. If hair looks stringy at this point, you either used too much oil, or did not get your hair wet enough.
3) Put in my gel, diffuse a bit, clip the top and impatiently finish air-drying.
My favorite oil to use is grapeseed because it does not feel too "oily," adds nice shine and doesn't make my hair look a different color.
I think the oil may soften the hold of some gels, so more oil = need a bit stronger hold.