Homebrew PCBs

I live in a small largely agricultural country any chemical is difficult 
to obtain (unless it has a household or agricultural use). I'd like to 
try hydrochloric acid and hydrogen peroxide as an etchant and I can buy 
HCl in the hardware store (for cleaning concrete) but H2O2 is a little 
more difficult $25 / litre for 35% plus hazardous goods freight from 
300Km away. Sodium Percarbonate is cheap and readily available as a 
cleaning agent. In solution Sodium Percarbonate becomes sodium carbonate 
and hydrogen peroxide. It seems to me that a mixture of hydrochloric 
acid and sodium percarbonate would end up as hydrochloric acid, hydrogen 
peroxide, salt and carbon dioxide. Has anyone tried percarbonate in this 
way as an etchant?