I have added gelatin and/or CNPF to my FSG!
Couple secrets I've come across with FSG - when in doubt, go thin. Take the seeds off the heat earlier and strain.
After I remove the seeds, I fill the pot with water, boil, and return the same seeds to make a 2nd batch. Then after straining I combine both batches and return to the heat to thicken them further.
You can also add corn starch. It can both thicken and add hold. "Dissolve" it in cold water first, then add it to your gel. (Start with a teaspoon or two - you can always add more.). If you want to add gelatin, now is the time, as well. Same method - mix with cold water first, then add. (And I'm talking small amounts of water, of course.)
Remove from the heat, let cool slightly, and add any oil, Epsom, CNPF, or anything else you like to add.
2c/3a/3b, Fine/med, Dense, high porous, & normal elas.
Lo-poo - Renpure Keratin, SMR, Giovanni SaS
clarifying - mix Johnson's H2T with low poo
Co-wash - Suave Nats. clar. or coco.
RO - GVPCB, Ion Eff. Care, TN.
LI - SMR, Cure Care, or RO
Seal - MO or Jojoba
DT - + honey, ACV, & EVOO to SM masque & GVPCB
PT - Gelatin!, CNPF
Styling - FSG, AIF, BRHG, LALS/PS, GF curl spray gel, SM Souffle/Smoothie, LOOB
Oils - MO!, EVOO, jojoba, GSO, SM Elixer, EVCO, VO5 Hairdressing