Custom Overlays UK: How to Brief, Specify and Order Bespoke Control Panel Overlays

Most overlay enquiries arrive as a PDF of the artwork and a question about price. The artwork is usually fine. What is missing is the information needed to quote the part properly: the panel drawing, operating environment, cutout positions, the substrate it will bond to, and how frequently the buttons will be used.

That gap is where the lead time goes. A material that looks suitable on the drawing may no longer be appropriate once, for example, it becomes clear that the machine will be installed in a food processing plant and washed down with caustic cleaner every night.

If you are sourcing custom overlays in the UK and want an accurate quotation and a part that is right first time, it helps to brief the overlay as a component rather than simply a print job. Here is what to include.

Start with where the panel lives

Before material, before artwork, before anything: describe the environment.

• Temperature range, including any thermal cycling
• Chemical contact. Name the chemicals. “Cleaning products” covers isopropyl alcohol and sodium hydroxide, and those two have very different consequences
• UV exposure, and whether the equipment sits outdoors permanently
• Abrasion sources: gloved hands, brushes, tools resting on the fascia
• Expected service life of the equipment, and whether the overlay is expected to last all of it
• Actuation count, if there are tactile keys

Everything downstream follows from that information. With the operating conditions clearly defined, the material and construction can be specified around the application rather than based on assumptions.

Material: the three usual answers, and when none of them apply

Polyester is the default for anything with keys. It flexes repeatedly without stress cracking, resists most industrial solvents and cleaners, and hard-coated grades hold up to abrasion. If the overlay has embossed buttons in daily use, this is almost always the right film.

Polycarbonate is more rigid, embosses deeply and cleanly, and offers excellent optical clarity for display windows. Its weakness is chemical resistance: alcohols, ketones, and several common cleaning agents will craze it. Strong choice for a fascia with a large display window in a controlled environment. Poor choice for anything wiped down with solvent.

PVC appears in appliance and lower-duty applications where formability and cost matter more than chemical or UV performance.

When none of the three will survive, the answer moves off film entirely. Engraved laminate holds legibility in conditions that destroy printed graphics. A printed overlay bonded to an aluminium or stainless steel sub-panel gives rigidity and a mounting face in a single part. Lexicraft manufactures all of these, which is the reason the material conversation happens before the quotation rather than after it.

Whichever material you land on, print second surface wherever the construction allows. The graphics go on the reverse of the film and the substrate protects the ink. Anything printed on the face has to survive on its own.

The dimensions that decide whether it fits

Artwork tolerance is generous. Mechanical tolerance is not. Send:

• A dimensioned drawing of the panel, not just the overlay outline
• Cutout positions and sizes for switches, connectors, LEDs, and displays, with datum references
• Overall thickness limits, particularly where the fascia sits in a recess
• Corner radii and any required registration features
• Adhesive-free zones

State the registration tolerance you need between print and cut line rather than assuming a house standard. Where a printed border frames a machined aperture, even a small amount of drift can be visible, so it is better to agree the tolerance before tooling.

Adhesive, embossing, and backlighting

Three specifications are often left out of briefs and cause avoidable rework.

Adhesive. Name the surface the overlay is bonding to. Powder-coated steel, textured ABS, and polypropylene all behave differently, and low surface energy plastics need a specific adhesive system. High-performance acrylic transfer adhesives are the industry standard, but standard is not the same as suitable.

Embossing. Say whether you want rail embossing around a key area or a raised dome over each button, and whether the tactile feedback comes from the overlay or from a switch beneath it. Emboss depth is constrained by the material and by the key geometry, so it is worth confirming early if the design depends on it.

Backlighting. Lit legends have to look solid when the panel is off and read clearly when it is on. That is an ink density specification. Screen printing generally handles it better because of the heavier ink deposit; digital printing earns its place on photographic content, variable data, and short runs.

Colour, legends, and variants

Supply Pantone references, while allowing for some variation between the reference chip and the finished part. A colour printed on matt-textured polyester will not necessarily appear identical to the same colour on coated paper. Where the overlay sits against a moulded housing, supplying the housing can be more useful than matching to a swatch alone. Colour matching to a customer standard is a normal part of specifying the job.

For panel families that share the same layout but differ by model designation, inserted legends or serialisation can help reduce the need for separate tooling and approvals for every variant. It is worth raising this at enquiry stage if you are specifying a product range rather than a single machine.

What ordering actually involves

Send the artwork, panel drawing, operating environment and quantity. From there, manufacturer can review the construction, confirm the material and adhesive system, and prepare the technical drawing for approval.

The drawing is the document to scrutinise, because it records the dimensions, cutouts, print positions and other agreed details that production will follow. Once approved, the part can move into manufacture and inspection in line with the agreed specification and quality requirements.

Lexicraft has been manufacturing bespoke Graphic Overlays and control panel fascias in Britain since 1956. For this type of work, the most useful starting point is clear panel drawing and enough information about where and how the overlay will be used.

Send us the panel drawing and application details, and we can advise on the most suitable material and construction for the job.