The best spray you can find. A professional bug sprayer friend of mine recommended this product 4 years ago. Its the only product I need to buy now. I live in Arizona and spray my house for spiders and scorpions every month. This stuff does the trick. We have never found a scorpion in the house and I owe it to this product. Highly recommend.

Don’t know what’s different about this year than all the others, but the scorpions are out with a vengeance. It’s seriously not fun. We’ve had them in our bed, in the dog beds, in the bathrooms, in the kitchen, in bedrooms, in the living room, on the ceiling, and the list goes on and on. Truly awful, and it was showing no signs of relief.We had been using Wondercide indoor pest control cedar scent spray, which did help, but didn’t solve. It smells great, which is a bonus, and is totally safe for us and our pets, which we love. But again, it didn’t eradicate the scorpions from our home.We tried the traps. Again, they work and serve their purpose, but they don’t stop the scorpions from entering, they only help catch them once they’re in. So problem still not solved.We’ve also tried other things: cedar wood blocks and chips everywhere, peppermint and other heavily scented scorpion deterrents, etc. No dice.We really tried to stay away from insecticide, because of how many animals we have, but we were at the very end of our rope. There aren’t many options when it comes to options that can kill scorpions. So this what we went with.We followed the directions and sprayed outside the night we received it. When we woke up the next day, it was like a graveyard out there. Dead bugs everywhere. Not just scorpions, but stick bugs, beetles, stink bugs, June bugs, a variety of spiders (including tarantulas!), mosquitos, crickets, and other things I couldn’t even begin to tell you what they were.Since then, we’ve also sprayed inside, and have found three dead scorpions, three dying scorpions, several new dead scorpions in the traps, and now, about a week in, no scorpions for two days in the house! One I found the first day that was still kicking, I grabbed him with my tweezers and put him in a bowl, then sprayed him. I watched him squirm for about 15 seconds, before he flipped over on his back and died. Just like that. Just stopped, flopped, dead.Also, we run a dog rescue here, and we have 19 dogs. During the day, the dogs are mostly outside in the yard and/or in their outdoor kennels. Since spot spraying and spraying the trees outside, there is a dramatic decrease in the amount of flying insects. >90% decrease in flies, mosquitos, moths, and June bugs. Amazing!So far, no ill effects on us, the dogs, the reptiles (snakes), amphibians (frogs), or small critters outside (bunnies) at all. No impact on the landscaping, no residue or discoloration left on the carpet, walls, or floors. No smell, except maybe a very faint buttery smell when it’s very first sprayed. It’s easy to mix, since the container has the built in measure, and you only need .5-1 ounce per gallon. That’s 16-32 gallons with this 16oz bottle. That’s a great deal for so much peace of mind!This stuff works. It’s safe and easy. Just follow the directions. Don’t over mix it (no need to waste it), make sure to let it dry completely before people or pets touch it, and you’ll be all set.

I've tried the big box home stores stuff and they weren't as effective or long lasting as this Onslaught FastCap. The key is the "microencapsulation" technology which allows for a controlled release of the insecticide over a longer period of time. This reduces the need for frequent applications.I use a two gallon pump-up sprayer every 2 months and apply FastCap liberally around my home foundation spraying up the outside walls 3 feet and out from the foundation about 2 feet. I also spray in my garage and anywhere else bugs can hide. Using a 1oz per gallon of water dilution I get well over 1 year from a 16 oz. bottle. It's initially expensive but the concentrate is actually a bargain if you do the math.Do what the pros do, use this FastCap and end your battle with spiders and scorpions. I found it to be quite effective for roaches as well.

Works fast!!

Good Patrons of the Amazon, rejoice! For I bring tidings of a mighty weapon forged not of steel, but of potent alchemy—a concoction designed to vanquish the eight-legged terrors that haunt our dwellings. Behold the Spider and Scorpion Insecticide, a champion in our battle against these unwelcome invaders! With this elixir in hand, no longer must we await the slow march of the exterminator’s arrival; we are now the masters of our own domains.This wondrous potion may be unleashed wherever danger lurks, both within and without, and as often as the need arises. Its power rivals that of the finest professionals, and indeed surpasses the crude tools some lesser exterminators have wielded in the past. With but a few sprays, the vile interlopers are struck down, granting peace and safety to our hearths and homes. It is a victory over vermin, achieved with ease and at a fraction of the cost!

Yes, you have to mix it. And yes, you have to get a sprayer!! But, IT WORK!!!!! Definitely will buy this again!!!