You need 4 of each team chem for it to take effect - it is very costly but you can slowly build it up by applying 1 each, say Dolphins passing, to your coach, stadium and both uniforms. If you don't have 4 of the same chem applied in any way they don't do anything.
For my team I did 4 each of Pass D, them two each of P, R and RD to max out those chems
I don't know the exact cost of them all total but I believe when you get to 10 it costs 10K training just to open the slots on all 4 items (coach, unis, stadium) I believe they are 2500 each
You need 4 of each team chem for it to take effect - it is very costly but you can slowly build it up by applying 1 each, say Dolphins passing, to your coach, stadium and both uniforms. If you don't have 4 of the same chem applied in any way they don't do anything.
For my team I did 4 each of Pass D, them two each of P, R and RD to max out those chems
I don't know the exact cost of them all total but I believe when you get to 10 it costs 10K training just to open the slots on all 4 items (coach, unis, stadium) I believe they are 2500 each