https://www.uyemura.com/pcb-finishes/electroless-copper.html https://www.uyemura.com/pcb-finishes/electroless-copper.html If you're wanting to do platted throu

https://www.uyemura.com/pcb-finishes/electroless-copper.html https://www.uyemura.com/pcb-finishes/electroless-copper.html If you're wanting to do platted through holes idk why you don't just use the same elecroless plating chemical that board shops use. You could call them and ask for samples and would get enough for all your hobby projects.