Is it permitted to use hair gel on Shabbat?
Answer:
Poskim generally prohibit the use of hair gel on Shabbos.
It is permitted to use hair spray.
Best wishes.
Sources:
The main problem involved with using hair gel is that this might fall under the category of memare’ach – smoothing something out.
The Maamar Mordechai (303:10) and Shut Zera Emes (Yoreh De’ah 89) address the issue and treat it as a Torah prohibition, and the Mishnah Berurah (303:81) writes similarly. Shut Yabia Omer (Vol. 4, Orach Chaim 28) writes that this is at least a rabbinic prohibition.
See also Shemiras Shabbos Chap. 14, nos. 48, 50.
