There is not a set temperature required for using Permethrin SFR, it is not an issue when mixing most products and most of the time we suggest something along the lines of warm or room temperature water.
Permethrin SFR will only control insects. Please take a look at our selection of Animal Repellents for products that can be used to keep rodents, squirrels, and rabbits away.
These products should not be mixed together. There is no valid reason to mix Onslaught and Permethrin SFR together. They are both synthetic pyrethroids so there would be nothing to gain by mixing these products together. Making a pesticide too strong can actually backfire. Areas that are treated with this overly concentrated spray will be repellent and insects will simply avoid the treated areas prolonging the infestation.
Permethrin SFR is not labeled for use on clothing and is not formulated for such a use. We do carry a permethrin-based product called JT Eaton KILLS Bedbugs, Ticks, and Mosquitoes that is labeled for use on clothing. It comes in a ready-to-use spray bottles and does not need to be diluted.