The ASTURO art. 0013900 B/P PB/NE special manual spray gun with bottom cup is a compressed-air painting tool designed for the application of dense products, textured coatings and technical materials that require a robust and practical spraying configuration. The screw-on aluminium bottom cup with capacity= 1,000 cc provides an adequate amount of material for continuous work on small and medium-sized surfaces, reducing downtime caused by frequent refilling.

The bottom-cup configuration is suitable for operators who need to coat metal components, automotive body parts, wooden elements, panels, plastic products, structures and surfaces requiring more substantial materials or specific textured finishes. The cup is filled directly with the prepared product and supports longer continuous working cycles, while keeping the spray gun practical for finishing, restoration and professional maintenance operations.

The spray gun can be used with clear coats, paints, single-component enamels, liquid shades, double-coat metallic finishes, heavy enamels and two-component coatings, provided that the material is compatible with spray application and the installed nozzle configuration. It is particularly suitable when denser or textured materials must be managed, as viscosity, dilution, air pressure and nozzle selection need to be set carefully in order to achieve uniform deposition and a surface effect consistent with the required result.

Spray quality depends on correct material preparation. Before use, it is advisable to mix the material according to the manufacturer’s instructions, verify any dilution requirements and filter it before filling the cup. Lumps, impurities, dried residues or poorly dispersed pigments can affect material flow, alter the spray fan shape and generate surface defects. With two-component products, mixing ratios, pot life and cleaning procedures must be followed carefully, because product hardening inside the spray gun can damage the material passages and functional components.

Material-flow and spray-fan adjustment allow the operator to adapt application to the workpiece and desired finish. A wider and more even fan is generally preferable for larger surfaces, while a more concentrated adjustment can be useful for edges, profiles, recesses and localised areas. Air pressure should be set progressively, avoiding excessively high values that may increase material dispersion or alter the textured effect, and avoiding insufficient values that may cause irregular atomization, uneven coverage or an excessively coarse finish.

For professional results, the spray gun should be kept at a constant distance from the surface and moved with parallel, regular and partially overlapping passes. Moving too slowly can promote build-up, runs or uneven texture, while moving too quickly can reduce coverage and make the finish discontinuous. A preliminary test on a sample or non-visible area of the workpiece is recommended, progressively adjusting air, material flow and spray fan until the required result is obtained.

The ASTURO 0013900 is not a measuring instrument and does not check dimensions, heights, transmission play or geometric form errors. Its precision is application-related and concerns the ability to distribute material repeatably by controlling flow rate, spray-fan shape, working distance, travel speed and coating thickness. When correctly adjusted, it helps improve visual uniformity, coverage and finish consistency.

Compressed-air quality is equally important. The air line should include filtration, pressure regulation and condensate separation, since water, oil or impurities in the air can affect coating adhesion and generate defects such as craters, pinholes, dull areas or surface irregularities. After each use, the cup, internal passages, nozzle, needle and air cap must be cleaned with a product compatible with the coating used, especially when two-component paints or fast-curing materials are applied.

The ASTURO art. 0013900 special spray gun with 1,000 cc bottom cup is therefore a practical solution for professionals applying paints, clear coats, enamels and higher-viscosity materials. Its cup capacity, manual configuration and spray-adjustment capability make it suitable for bodywork, maintenance, industrial finishing, woodworking and technical surface-treatment applications.