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If your etchant is in a plastic tub you can float that tub in a sink or larger tub of hot water. You will have to keep a hold on it to keep it from spilling into the larger tub, but you will want to rock the etchant anyways.
EDIT: I agree with the others who say your solution is too weak.
I made the PCB only a half a cm break but will get over that.I bought a minidrill that drills holes the size of a veroboard.Some components on my PCB require a small hole so should i do it or what?
It may underetch the trackes - i.e. etch underneath where its meant to be etching.
Can't you stick it in the microwave for 10 seconds or so ? (obviously taking the PCB out)
You might also try turning the PCB upside down so the copper side is facing the desk - the copper will etch more readily with the spent stuff "falling off".
Cold Ferric Chloride is a bit of a waste of time unless its very concentrated.