If you use Posca pens (water-based acrylic markers) and plan to seal the painted surfaces afterwards with a clear varnish (car paint, e.g. as a spray), here is a structured overview:
1. which Posca pens are suitable? Posca markers are available in different tip widths (PC-1M, PC-3M, PC-5M, PC-7M, PC-8K, PC-17K, PCF-350 brush tip etc.) - all use the same water-based pigment colour and are basically suitable for numerous surfaces Source: Jackson's Art Supplies Source: iArt Supplies - Blog Source: Upfest
The choice of tip depends purely on your desired application (fine lines, large areas, detail, brush technique etc.). 2. preparation before applying clear coat Allow to dry: Make sure you allow the Posca paint to dry properly - ideally for several days in low humidity. This reduces the risk of cracking or smearing under the clear coat Source: ShunPoly Source: Reddit
Spray technique instead of brush: Use spray clearcoat - brush application can remove the colour or spread it unevenly Reddit Source: WetCanvas
3. which clear coat is suitable? a) Water-based, acrylic clear spray paint Recommended by experienced users: "Krylon acrylic clear coat (generally matt). Works like a charm." "Rust-oleum clear matte... let the pens dry well" Source: Reddit
Rust-Oleum Clear Matte or Satin are also often recommended. Important: spray several thin coats and allow to dry well in between Source: Reddit
b) UV-resistant acrylic spray (e.g. Micador Crystal Clear Spray) Commonly used for artwork on paper, wood, glass, plastic etc. - protects against fading, is water resistant and available in matt, semi-gloss or gloss finishes Source: PoscART Australia
c) Clear coat on other surfaces (car, plastics, metal) Universally applicable: Acrylic-based spray clearcoat or polyurethane varnish is suitable for surfaces such as wood, metal, glass, plastic, cars, stone, etc. Source: iArt Supplies - Blog
Important: For flexible surfaces (e.g. plastic, car body), make sure to use flexible paints or use flex additives if necessary (e.g. for backpacks that move) Source: Reddit
4. precautionary measures Testing before application: It is best to test on a sample first - especially with complex substrates or spray ceilings. Avoid non-matching clear coats: Some paints contain solvents that can dissolve Posca paint - such as synthetic aerosol paints or unsuitable polymers Source: Reddit