Description
Our verdict: A strong, fast-acting spray for treating the places spiders come in, and for dealing with spiders you can see. Cypermethrin is a synthetic insecticide, so the barrier it leaves is tougher than a natural spray’s. The 500ml can suits a few rooms or a garage rather than a whole house.
Best for: spot treatment, garages, sheds and problem rooms | Size: 500ml | Active: cypermethrin
What is Karlsten Spider Killer Spray?
Karlsten is a UK home-and-garden pest brand. Its Spider Killer is a ready-to-use cypermethrin spray designed to kill spiders on contact. Once it dries, it leaves a residual barrier that Karlsten says lasts up to 6 weeks, so spiders that cross treated surfaces later are also affected. It is HSE registered (HSE 10668).
Cypermethrin is a synthetic pyrethroid. Compared with natural pyrethrum sprays such as Pestmatic, it tends to hold up longer on surfaces, which makes it a good fit for garages, sheds, window frames and other spots that spiders keep returning to.
How to use it properly
- Vacuum webs and egg sacs from corners, ceilings and behind furniture.
- Spray entry points. Treat window frames, door thresholds, vents, air bricks and gaps around pipes.
- Treat edges and dark spaces. Spray skirting boards, under beds, behind wardrobes, and in garages, sheds and lofts.
- Spray visible spiders directly to kill them on contact.
- Keep children and pets away until treated areas are dry, and reapply as the label directs.
Pros and cons
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Who should pick something else?
- Treating a whole house? Pestmatic Spider Killer 1L covers more for the money and is odourless and non-staining.
- Have pets and prefer a repellent? Try Zero In Peppermint Spider Repellent.
- Prefer to catch and release? The Pest Guard Spider Catcher picks them up from a distance.
Frequently asked questions
Does Karlsten spider killer kill on contact?
Yes. It’s designed to kill spiders it’s sprayed on directly, and to leave a residual barrier on treated surfaces.
Where should I spray to keep spiders out?
Concentrate on entry points: window frames, door thresholds, vents and air bricks. Then treat skirting boards and dark corners. Spraying open floor or walls does little.
Is it safe around pets?
Keep pets out until treated surfaces are dry, and take extra care with cats, which are especially sensitive to cypermethrin. Cover fish tanks before spraying. See our guide for homes with pets.
Related guides
- It’s not an invasion, it’s spider mating season: what actually keeps them out
- Pest control products for homes with pets
Manufacturer details and safety information
- Brand: Karlsten
- Volume: 500ml
- Active ingredient: Cypermethrin
- Form: Ready-to-use spray
- Registration: HSE 10668
- Residual protection: Up to 6 weeks (manufacturer claim)
- Very toxic to aquatic life with long-lasting harmful effects.
- Use biocides safely. Always read the label and product information before use.
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