How bad are the fumes? if I apply it in the morning will I be able to stay in the house that night?

As understand it, it is the oil that is included in the liquid that takes the longest time to dry up. The smell lasts about 24 hours but this largely depends on the air flows.When I have used it in an enclosed space, I have vacated the area for a week. G Mitchell

can I apply this woodworm killer onto varnished wood, ie floor boards, or does the wood have to be sanded first

I'd give the wood a light sanding to aid penetration. You'll find the product has a slightly oily texture when applied and takes a bit of time to sink in.

Will this affect the colour of the wood? It states clear - but will it leave a shine or any coating on the wood? I want to oil / wax the wood after.

No it didn't affect the wood at all. I have applied wax with no problems.

Is it possible to use this product on treated wood? Is it oil or water based?

I used it on wood that was painted and and it didn't damage it. It is water based ,I filled a hypodermic syringe and it was thin enough to be injected into the wood worm holes and caused less mess. Just make sure you wipe any excess off.

500ml Woodworm Killer

Product ID: 52249159

Details

Item form
Spray
Item weight
1.04 Pounds
Liquid volume
500
Brand
Cuprinol
Global Trade Identification Number

⏳Long-lasting protection

🌿Low odour, eco-friendly solvents

🛡️Kills all woodworm types

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Bs.619

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Sold byAmazon BoliviaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Item form
Spray
Item weight
1.04 Pounds
Liquid volume
500

Description

🪵 Protect your wood, protect your legacy.

LOW ODOUR FORMULA - Enjoy a pleasant, hassle-free application without harsh chemical smells.
TRUSTED EXPERTISE - Backed by 75+ years of Cuprinol’s woodcare innovation and quality.
DEEP PENETRATION POWER - Ensures years of reliable protection beneath the surface.
TOTAL WOODWORM DEFENSE - Eradicates all wood-boring beetle larvae for a pest-free home.
FURNITURE FLOORBOARD FRIENDLY - Perfectly safe and effective for your most valued wooden interiors.

Cuprinol 500ml Woodworm Killer is a professional-grade treatment that kills all types of woodworm larvae and prevents reinfestation with deep wood penetration. Its low odour, low aromatic solvent formula makes it ideal for use on furniture and floorboards, providing long-lasting protection backed by over 75 years of Cuprinol’s trusted woodcare expertise.

Specifications

Part number	5083434
Item display weight	213 g
Manufacturer	Toolbank
Item model number	5083434
ASIN	B003UGKR90

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