Recycled materials are more soluble in organic solvents than new materials, resulting in silver wire cracking often occurring after engraving. The general solution is as follows:
First, the choice of acrylic pigments (resins), this can be bought in the general art store.
Second, the choice of amino paint, this can be bought in general chemical stores.
Third, after the paint is finished, it is polished.
When the board is static, it is easy to adhere to dust. Before silk screen or paint, wipe it with a soft cloth dampened with 1% soapy water to achieve a clean effect.