You can foam Dominion itself into voids but you will need to purchase a foaming concentrate such as Profoam to add to the solution and you will also need a foaming device such as the Chapin Poly Foamer to make the solution into a foam. You can also choose to use a ready-to use foam such as Termidor Foam which is a non-repellent too. It can take up to 90 days to see the full effect of using a non-repellent product as it is designed to have a slow kill.
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To achieve low expansion you would use 0.5 up to 1.5 oz of ProFoam per gallon of mixture. To achieve high expansion you would use 1.5 oz up to 9 oz of ProFoam per gallon of mixture. We typically recommend using about 2 to 3 oz per gallon of mixture. Please keep in mind that expansion rates will vary depending on pH and temperature.
Either foamer would be a fine choice for this application. The B&G Versafoamer HH - 1 Gallon Foamer does have a metal tank, and all parts on B&G machines are replaceable as these machines are intended for frequent use. The Chapin Poly Foamer will be fine for your application and is significantly less expensive. You can also read Customer Reviews on each of these product pages.
The Pro Foam Foaming Concentrate when used with an insecticide in a wall void will last an unspecified period of time, but definitely not permanently. This is not a hardening foam like an insulation. This is only used as an agent to help the insecticide you want to have farther reach. The foam will slowly start to dissipate after it's been applied, based on the mix rate you used. It likely would be dissipated after an hour or so or potentially less.
No, el ProFoam (Platinum) Foaming Concentrate no ayudaria con las moscas de drenaje, solo ayuda a hacer espuma y si necesitaria agregar otro quimico como InVade Bio Drain. Si necesita un producto que haga espuma e incluya algo como InVade Bio Drain, que ayuda en la descomposición de materia orgánica en el drenaje, entonces puede usar InVade Bio Foam.