MGK Onslaught FastCap Spider and Scorpion Insecticide | Pint | Indoor/Outdoor Concentrate, Commercial Grade, Labeled for Many Pests, Quick Kill
Condition: New
Buy Now, Pay Later
As low as
$11.32
/ mo
Learn more
- – 6-month term
- – No impact on credit to apply
- – Instant approval decision
- – Secure and straightforward checkout
Ready to go? Add this product to your cart and select a plan during checkout.
Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.
Learn more about financing & leasing here.
Free shipping on this product
30-day returns
Learn more
30-day refund/replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
In Stock.
Arrives
Thursday, Aug 27
Recently Viewed
Features
- CONVENIENT PEST CONTROL: Protection against a wide range of residential and commercial pests populations including spiders, scorpions, fleas and mosquitoes.
- QUICK KILL: Onslaught FastCap Spider and Scorpion Insecticide offers a convenient and approach to pest control.
- INDOOR AND OUTDOOR APPLICATIONS: Effective pest control in and around livestock facilities, on turf, ornamentals, landscapes, and in food and non-food areas of commercial and residential structures.
- ACTIVE INGREDIENTS: Combines esfenvalerate and prallethrin with synergist piperonyl butoxide (PBO) for fast-acting pest control.
- A LEGACY YOU CAN TRUST: Driven by expertise and industry commitment, MGK has been developing pest control products based primarily on botanical and innovative technologies since 1902.
Description
MGK 10085 Onslaught FastCap Spider and Scorpion Insecticide, Off-White
Item Form: Spray
Item Weight: 1.2 pounds
Liquid Volume: 1 pints
Active Ingredients: Esfenvalerate,Prallethrin,Piperonyl Butoxide
Brand: MGK
Brand Name: MGK
Unit Count: 16 Fluid Ounces
UPC: 848920000492
Included Components: Insecticide
Item Type Name: Spider and Scorpion Insecticide
Manufacturer: MGK
Model Number: 10085
Part Number: 2964-D05
Item Form: Spray
Target Species: Insects
Item Weight: 1.2 pounds
Liquid Volume: 1 pints
Active Ingredients: Esfenvalerate,Prallethrin,Piperonyl Butoxide
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Aug 27
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
- Klarna Financing
- Affirm Pay in 4
- Affirm Financing
- Afterpay Financing
- Zip Pay in 4
- Financing through Apple Pay
- Financing through Google Pay
Learn more about financing & leasing here.
Similar Products
$4/mo*
Peppermint Oil to Repel Mice and Rats, 4 Pack Rodent Repellent
$2/mo*
Black Flag Extreme Home Insect Control Concentrate 16 Ounces
Top Amazon Reviews
Style: Scorpion Insecticide
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.
...
show more
Reviewed in the United States on June 20, 2024 by Nicole S.
Style: Scorpion Insecticide
Scorpion season started earlier this year in South Texas. Ordered this after reading reviews for multiple days and feeling confident that it will help us. Morning started with us finding a scorpion in the laundry room. We caught it in a glass and sprayed one part of the floor with Harris scorpion killer and the other part with Fastcap scorpion killer and waited for both sides to dry. Sat the scorpion on the Harris side and turned the vase over it so it can be controlled on the treated area. Let it run around for about 30 seconds (seemed a reasonable time for it to naturally cross over) and scooped it back into the vase. Watched it for about 2 hrs happily crawling around the vase. No lameness no twitching. Just alive. Time for the second test. This time sat it on the fastcap treated area and again let it run around for 30 seconds. Scooped up and watched it. Here is what happened after exposure: After 2 minutes he got really really slow and we saw right away something is effecting him. After 5 minutes he started acting like a drunk. Uncontrolled body moving, legs kinda tried to crawl in the air and the tail bent over its body. After 10 minutes he flipped on his back and started twitching like crazy. Then nothing. Legs curled up, tail went straight and no movement at all. I moved the lifeless body around in the vase to test any reaction- NOTHING! Watched him for the next 3 hrs. Checked about all 20-40 minutes. At the beginning there was still some slight movement in the legs and pinchers here and there but you could definitely tell it’s just muscle spasms. After 3 hrs I disposed of a dead scorpion. To be fair, he was first exposed to Harris but lived on. Not saying that didn’t somehow affect him but after exposure to fastcap it went very quick. After that I sprayed my entire inside of the house. Under the sinks, behind washer/dryer and along all perimeter of the inside. It’s raining but as soon as the rain will stop I will spray generously outside up the siding and along the base and grass surrounding about 2 feet of the house. My goal is to knock em out the way I saw it happen today before they even get the chance to find an entry point. I’ll probably repeat my experiment with fastcap in about a week to see how the stuff works after some time and will update my review then. For now all I can say is I am happy seeing first hand that it kills these crustaceans fast and am looking forward to report the effectiveness in a couple of days regarding the left over strength HOPEFULLY less scorpion sightings. Before any treatment we found 6 within 7 days.
...
show more
Reviewed in the United States on May 5, 2025 by Jason McCulloch
Style: Scorpion Insecticide
This is Arizona, so we have the very poisonous bark scorpions, which makes using something this potent reasonable. (Don't use where bees frequent, as it will also kill bees if they come into direct contact with it.) I purchased this after being stung inside where professionally-applied insecticide had previously been used. (That seemed to make the scorpions drunk, but did not kill them.) Scorpions nest in groups of 30+, so if you spot a live one, there are others nearby--and whether drunk or sober, they tend to be cranky. As an extra precaution, I recommend wearing a mask (paper surgical-type mask does NOT keep fumes out--use a cloth mask) and nitrile gloves. I also use eye protection when preparing and applying--this is strong stuff. I have asthma but had no side effects and smelled no odor whatsoever when I took the mask off. (NOTE: I recently switched my eye protection to a new brand, which I also reviewed here recently. It's much better at not fogging up or allowing any mist to reach my eyes throughout the time I'm spraying. So if your protective eyeware doesn't fit well, you may want to try another brand.) This scorpticide comes in a multi-application concentrate in a bottle that is designed to allow easy titrating for correct mixture per application. Although it comes as a milky concentrate, after dilution it dries as a colorless, odorless substance. By using the narrow stream setting of applicator, there is no mess and less chance of spray going where you don't want it. I also used an inexpensive battery-operated applicator, which made the job very easy. I sprayed edges of patio, windows and doors inside, closets, under appliances and around floorboards and in outside storage room. In the weeks since applying, the only bugs of any kind I've found, including scorpions, have been dead, which is a good sign, since scorpions eat those bugs and spiders. Note: I do not have any pets, so I would say to keep them away from treated areas until they are dry, probably a couple of hours if you apply correctly. NOVEMBER UPDATE: Throughout the summer, the application continued to be effective against scorpions and other bugs. If I found any bugs at all, inside or outside on the patio, they were dead--even though the patio has been hosed down several times. (I paid special attention to door/window frame areas when spraying, and the sliding door track). Last week, I did find 2 tiny very-dead scorpions on the floor just inside one window; I'm crediting the scorpticide with the kill--I mean, I didn't see any signs of suicide or a heart attack :0). My plan is to apply again in early spring, before creepy crawlies start to get active again. (Since we have very mild winters here in the desert, it's possible I'll need to reapply before spring--if so, I'll update this review.)
...
show more
Reviewed in the United States on June 25, 2023 by Commonsenseplz
Style: Scorpion Insecticide
Kill a SCORPIONS, CRICKETS and spiders. Easy to mix and use.
Reviewed in the United States on July 20, 2026 by Christopher
Style: Scorpion Insecticide
Give it time to work. I sprayed, but it took about a week to notice that there were fewer spider webs. It's lasted 5 week now. 5 minutes of spraying every month will probably keep you happy.
Reviewed in the United States on July 14, 2026 by A. Sabala
Style: Scorpion Insecticide
Worked fantastic for my scorpion and nuisance spider problems.
Reviewed in the United States on June 4, 2026 by Chris B.
Style: Scorpion Insecticide
We've used this for 8 years and seldom see a bug. Scorpions are a big problem I'm AZ and this kills them before they can get inside. Great product and I highly recommend it.
Reviewed in the United States on June 25, 2026 by Amazon Customer
Style: Scorpion Insecticide
Live in AZ and bought this product and one of those pump sprayers to apply around the house. Since using it outside of the house (about every 2 months), no more scorpions or other bugs. One bottle has lasted me a year.
Reviewed in the United States on June 17, 2026 by geezy