I've tried re-wicking my Evod heads about 5-6 times using cotton but there is little or no vapour being produced! what am i doing wrong!!??
Cotton wick is a game changer. The biggest thing to remember is that "less is more" when using cotton. Try using just enough to go through the coil but can still easily move while still touching the inside of the coil (cotton will expand just a bit when wet). You also do not want plump ends and want to twist it so that the cotton coming out the ends of the coil do not bush out and stay like a strand of silica (same thickness through out the entire wick). It can be tricky but will work great once you figure it out. Hope this helps!
Edit: You also do not want to move the coil. There is a possiblilty that you may have moved the coil and are causing a short (hence the no vapor). Do you have a meter to test the resistance?
I don't have a meter but ordered one from FT so still waiting on that to come.
By the way im using (80% vg 10% pg) e-juice and rest it 10% distilled water
the standard stock heads with silica producing good amount of vapour but the heads seems crap so i want to make my own.
I think...I think iv'e sussed it! same sort of vapour as the silica but it's working better than me previous try.
I put a very small amount of cotton, twisted then inserted into the coil then used some 60%PG 40%VG e juice.