Spray Painting near you

Spraying does two things that brushing does not. It reduces the coating to particles small enough to be inhaled deep into the lungs, and it fills an enclosed space with a suspended mist of solvent and pigment. SafeWork NSW publishes a code of practice for spray painting and powder coating precisely because those risks need managed controls rather than general care, and it is the document to ask a contractor about when spraying is proposed inside a building.

Where the product is a two-pack polyurethane, the hazard sharpens. SafeWork NSW describes isocyanates as highly reactive organic compounds that easily become volatile and enter the atmosphere as a vapour, and warns that sensitised workers may suffer allergic reactions including occupational asthma, dermatitis, hives and rashes at very low or brief exposure. Its control guidance runs to eliminating use where practicable, then engineering controls including local exhaust ventilation, automated processes or spray booths, full-face respirators, and a program to correctly fit, instruct on the use of and maintain that equipment, with health monitoring where the risk to health is significant.

Solvent-borne coatings also create a flammable atmosphere in an enclosed space, so ignition sources matter: pilot lights, heaters, switches, extension leads and anything that sparks. Nobody should be in the building during spraying who is not part of the work and properly protected, and that includes pets. Re-entry depends on ventilation and on the product, not on the mist having settled.

Overspray landing on a neighbour's car, roof, solar panels or pool is the most common complaint arising from residential spraying, and it is the hardest to resolve because the damage is on someone else's property and often only visible days later. The practical defences are simple: tell the neighbours before the day, spray only in suitable conditions, screen the work, and stop when the wind changes.

Waste is the other environmental question. Leftover paint, rinse water, solvent and contaminated rags do not belong in a household bin, on the ground or in a stormwater drain, which in most Australian streets runs untreated to a creek, a river or the sea. Every state has an environment regulator, and every council area has a route for household chemical waste, so the correct question to a contractor is where the wash-out and the leftover product will go.

There is also a fire point worth stating. Rags and cloths soaked with oil-based product, particularly linseed-based finishes, can generate heat as they oxidise and have caused fires in bins and on building sites. They are laid out flat to dry or sealed in water in a metal container, not screwed up in a plastic bag in a hot shed.

Spraying earns its setup cost on surfaces that are large, repetitive or profiled. An empty house being fully repainted, a long timber or metal fence, a set of louvred doors, a decorative balustrade, a pressed metal or profiled ceiling and any joinery where a brush mark would be visible are all cases where the finish and the speed justify the masking.

It is the wrong call where the area is small relative to the setup, where the room is occupied or full of contents, where the surrounding property cannot be protected, or where the substrate needs the coating worked into it rather than laid on it. Bare porous timber, chalky old render and heavily patched plaster often benefit from a brushed or back-rolled first coat that pushes product into the surface.

A common compromise is to spray and back-roll: the coating is applied by spray for speed and immediately rolled to work it in and even out the film. It gives better adhesion on porous surfaces than spraying alone and is far faster than rolling everything, which is why it is standard on new plasterboard and on large exterior wall areas.