which material do you use between the plates as a waterproof seal?
also how do i clean the plates after having cut holes in them? i suppose soap or other cleaners aren't good when using them for electrolysis later? :/
The most simple and cheapest gaskets that i use are made from flexible PVC.I buy it by my local store that sells large sheets for:Teich Pfütze Tümpel for fisches in your garden... 
Not sure what the right german word is.In English it is called a pond. In my country they say: vijverThe thinkness i use now is 1mm. It is similair as the Anton guys do. But that is just coincident.I used in the past 0.5mm, but with my current material is found out that 1mm is better. Make your gaskets as small as possible to maximize the use of your plates.Last tip:All holes in your plates MUST be out of synch of eachother.Thise prevents leakage of current and makes your cell 10% more efficient. What most people dont know is that sanding your plates help.It makes a larger surface on micro level.
About cleaning: if you use NAOH or KOH then you can be sure that your plates will be cleaned!
Hahahahaha.
If you rinse the plates proper after sanding should be sufficient.
Try not to touch the plates after the sanding.rinsing with your fingers.
Thats all.
regardsSteve
