I am currently Rank 10 in GTA 5 and I still cannot unlock crew sprays. Is it an in-game bug, or should I do something specific?
If you are referring to the crew paint job color for cars, you need to be level 20.
From IGN's Wiki on Crews:
- Level 20 - Able to set crew emblem decal, and color on cars
I believe that this is your Crew level, and not your character level.
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Just to add a little more information to the post: You can check your active crew level by navigating to the Rockstar Socialclub website, click on your active crew and when you're on the crew's page select 'GTA Online'. – Mano Dec 8 '16 at 16:05