Talstar P Professional Insecticide is a water-based chemical and will not cause corrosion to stainless steel or galvanized metal. Keep in mind that you should not apply this product directly to food, feed, water, or sources for food or water. You also cannot apply this in a way that would contact the animals or their food or water. Keep in mind that a good fly control program includes the use of multiple control measures such as baits and traps, in addition to insecticides.
Talstar P is applied at the rate of 1 oz. per gallon of water per 1000 sq. ft. for June bugs. You can apply monthly outdoors and every 90 days indoors.
Talstar is meant to be applied to cracks and crevices not as a broadcast to floors. If you do mop an area that Talstar has been applied, then you could potentially take the product up and Talstar would need to be re applied.
Talstar P can be tank mixed as long as both product labels are followed for rates. Talstar is a great product to use for beetles, just avoid spraying the blooms to prevent burning/harm.