DIY insect killers: Additives to mix with Bifen IT

Following the suggestion here, I did a little research and found two options for bug spray: an off the shelf product or DIY. In terms of per ounce active ingredients, the off the shelf solution is about ~10 times more expensive. I’m wondering if I go the DIY route, are there any additives I should add to increase the retention/longevity of the active ingredients in the perimeter barrier, like surfactants and ammonium sulfate for glyphosate?

Answer With credits to reddit, there are a few adjuvants to mix with Bifen:

• Insect growth regulators: Pyriproxyfen (Nyguard), Methoprene (Precor).

• Pesticide synergist: piperonyl butoxide (Exponent).

• Wettable powders formulations are often longer lasting.