Decorative “threaded effect” process

Corten-steel effect
1 February, 2018
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This "threaded" effect is characterized by producing different coloured thread-like fibres on a pigmented base. The effect is achieved by applying a special varnish, under controlled pressure and gun spraying conditions.
An important part of obtaining this effect is the pressure at which the product is applied, the passes of the spray gun and the distance between the spray gun and the surface to be decorated.
At high pressure (3.5 - 5 bar) the product must reach the surface in the form of a spider's web. If the distance is increased, the formation of the spider's web will be more accentuated. It is also important to remember that open passes of the spray gun will produce larger threads while more closed passes will result in smaller threads. The personal preference of the individual applying the product will determine the final choice of thread size and amount thereof on the piece. The "threaded" effect can be obtained after performing a series of steps:


Step 1: Preparation of the surface
When working with woody surfaces (MDF, plywood or wood), apply base coats (usually pigmented white) until a good preparation is achieved. You must determine the number of coats to be applied and the drying time between each coat to decide whether intermediate sanding processes are required. In order to avoid sanding between coats, coats must be applied no more than 3 hours apart. If coats are to be applied at longer intervals, sanding between coats will be necessary.When working with non-absorbent surfaces (melamine, glass, metal), no base coat needs to be applied and you may go directly to Step 3 or Step 5, depending on the desired decorative process in each case.
Step 2: Sanding
We recommend drying times of not less than 24 hours after application of the last base coat before proceeding with final sanding. Suitable sanding grains must be selected to ensure a perfect cut and preparation of the film.
Step 3: Pigmented finish
The next step consists in the application of gloss polyurethane pigmented finish (PO) of the desired colour. Apply a conventional coat that can be estimated in the amount of 100-140 g/m2 at a pressure of 2-3.5 bar. This finish will be suitable for the type of surface used (absorbent or not), as discussed in Step 1.
Step 4: Burnishing
After approximately 5 hours, we will proceed to burnish the surface of the pigmented finish. The lack of deep hardening thereof will increase adhesion between the coats of this base colour and the protective finish that is applied after achieving the "threaded" effect.
Step 5: Application of the "threaded" effect
Apply the "threaded" varnish or lacquer in the desired hues (HG) at high pressure (3.5- 5 bar) so that the product reaches the surface in the form of a spider's web. Open passes for larger threads, semi-closed passes for smaller threads, designed according to the preferences of the person applying the product, like the number of threads to be deposited on the surface.
Step 6: Protection
These applied fibres must be protected since they are completely exposed. By applying a transparent finish (polished or matte), those threads will be captured by fixing them definitively to the surface. The number of coats of transparent finish to be applied may vary significantly depending on the thickness of the thread to be coated and the actual coating of the finish itself. In order to achieve a completely smooth surface, the thread must be completely and thickly coated with film. Successive coats of finish must be applied at intervals of between 15 and 24 hours. Remember to burnish between coats before applying the next coat to ensure proper adhesion between coats.
NOTE: In high-temperature environments, consider using suitable solvents for diluting varnishes.

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