Equipment and application

Compression sprayers and ULV units both run the product. Which one you reach for is a question of area rather than of performance: a trigger sprayer for a room, a compression sprayer for a floor or a site, a ULV unit where a large volume has to be applied quickly and evenly.

Recommended nozzle 0.3 mm, giving a controlled fan along an edge rather than a mist into a room. A wider nozzle wastes product on surfaces you did not intend to treat and makes the edge harder to keep even. Values are pending verification.

Trigger sprayer: consumer and single-room professional work. No setup, no cleaning down, and enough control for a bed frame or a skirting run. Slow over large areas and hard on the hand after an hour.

Compression sprayer: the working default for professional use. Consistent pressure gives a consistent line, which is what makes a coverage figure mean anything. Pump to the working pressure, keep it there, and repressurise before the line starts to thin rather than after.

ULV: for volume in large or complex spaces. It is a distribution tool, not a licence to treat the air. The target is still the surface, and the operator still walks the edges.

Microfibre cloths for detail work on frames, brackets and furniture. Faster than spray on a complicated shape, and it puts the product where you are looking instead of on the wall behind it.

Technique. Hold a consistent distance from the surface. Move at a steady speed. Overlap each pass slightly so there is no gap along the route. Treat cracks, crevices, seams and entry points deliberately, because those are the routes, and a perimeter with one untreated joint in it is a perimeter with a door in it.

The three faults worth correcting in anyone you train. Saturating: pooling wastes product and extends drying without extending life. Rushing the corners: a corner is where two edges meet and is the single most valuable centimetre in the room. Treating a surface that has not dried after cleaning: the coating bonds to the water, not the wall.

Cleaning down. Rinse the sprayer with water after use and do not leave product standing in the tank between visits. Keep a dedicated unit for this product where you can; cross-contamination with a residual insecticide is a compatibility question you do not want to answer in a client's kitchen.