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Following the suggestion here, I did a little searching 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?

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  • How long are you targeting between applications? When I used Bifen as a barrier, I had excellent results with a 4 month schedule in a wet and sunny environment. For longer than that, you could try fipronil as a barrier. May 25 '21 at 13:19
  • Certainly the longer the better (hence the question) :) But 4 month sounds long enough! Was that just Bifen without any adjuvants?
    – Roc W.
    May 25 '21 at 15:58
  • Yes, in fact that identical product if I recall correctly. It may depend on the pests in question, which were cockroaches in my situation. I also recall that I used one of the richer mixture ratios as specified on the label, which may have contributed to the longevity. This did make the dried product have a faintly milky residue, but this was a non-issue for an outdoor perimeter spray. May 25 '21 at 21:03
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With credits to reddit, there are a few adjuvants to mix with Bifen:

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