Bumping because I wish I knew, too. Silicone worked great, but now that I'm off that I haven't found anything that works as well.
I have some success with homemade sprays calming down that outer layer--olive oil, water and honey, and then most recently just 50/50 olive oil and water. But there's still a halo of frizz. Very frustrating.
Type 2c: coarse, high-density, low porosity (so it would seem)
Avoiding protein and glycerin; going for soft, non-crunchy, frizz-free waves
CO & RO: Tresemme Naturals Moisture
Sealer: Olive oil
Leave-in/Styler: Kinky Curly Knot Today
DT: olive oil and honey