Dip and Spray Pre-Treatment

Bespoke solutions


High specifications


Proven designs


Excellent service

Dip and Spray Pre-Treatment

td finishing are experts in Dip and Spray Pre-Treatment Systems. They specialise in the supply and installation of equipment for a wide range of process requirements. Recent projects have included large dip-pre-treatment & powder coating systems, for Qualicoat standard Architectural Aluminium.

We’ve also worked on small online spray pre-treatment systems including 2.5 stage chemical and rinse for office furniture, and much larger silane-based pre-treatment systems with Demineralised rinse water requirements, running at rates of up to 5 metres per minute.

Pre-Treatment Systems

td finishing’s experience ranges widely across industries and we can offer advice. From the more general domestic pre-treatment regimes, to the modern, more environmentally friendly and better performing chemical processes.

These types of processes give an improved salt-spray performance, approaching those of traditional zinc-phosphates. As well as exceeding those of general industrial iron phosphates.

Dip Pre-Treatment

Fully Welded Stainless Steel Tanks

td finishing manufacture all process tanks to the highest of specifications. We use thick-gauge stainless steel, of the correct quality, to suit each part of the chemicals in the process. Each tank is fully welded, treated and tested before despatch.


Each tank, where required, is provided with a suitable means of heating. Typically, both gas and electric heating is required at different stages within the system. This is provided via in-direct gas-fired stainless-steel immersion tube, with ducting to atmosphere. Alternatively, chemical resistant stainless-steel electric elements can be used. Also, where necessary suitable lip-mounted extraction is also provided.

Overhead Transporter System

A twin hoist system will be provided, along with a structural-steel gantry. With a more than adequate SWL, the system is also designed for variable speed operation and basket tilting to facilitate drainage.

Situated alongside the Gantry will be a personnel access platform, allowing the operator suitable visual confirmation during operation.

Durability and Simplicity

td finishing dip pre-treatment systems are built-to-last, designed for ease of operation and require little maintenance.

The process parameters, once determined, can be partially automated. The equipment can also be supplied with dosing pumps, tank filtration systems, RO water units, PH Correction and water recycling plant.

Spray Pre-Treatment

Fully Welded Stainless-steel Housing Modules

All our Spray pre-treatment systems are manufactured with fully welded stainless-steel housing modules for quick assembly on site, with sealed bolted joints.

Easily Adjustable Spray Nozzle Assemblies

The Process tanks for each stage recirculate the liquid with a centrifugal pumping system. The pumps feed from stainless-steel pipe work to internally mounted CPVC standpipes within each stage. Each standpipe has quick release couplers and easily adjustable spray nozzle assemblies. This allows for easy maintenance of the system and quick replacement where required.

For heated stages, the tanks are fitted with a highly efficient tube-firing gas burner or chemical-resistant submersible electric elements, where appropriate.

Longevity and Hassle Free Production

Entry and exit extract fans, maintenance walkways & access doors, internal lighting and twin-pump mesh filters are always incorporated into the standard design. The benefits of which include; minimal mist encroaching into the factory space, allowing easy & safe access into the plant, as well as protecting the pump from unwanted contaminants. This not only ensures longevity, but also a hassle-free production.

Whether it’s combined degrease-phosphate, or chrome-free Qualicoat Aluminium, td finishing have the experience and proven track record to provide bespoke, industrial pre-treatment solutions.