Go to Walgreens, Rite Aid, or a store like that. U want ORGANIC cotton balls. It's because the cotton isn't bleached in some weird chemicals to make them REALLY white.
I have rebuilt a TON of heads and was great at it at first. No problems. No nasty taste, except the wick and wire breaking in, which I could deal with, but MAN, lately ALL I am getting is a HORRIBLE burnt taste. Don't know what the heck I did different from before, but the taste is unbearable. It tastes exactly like burnt rubber. I can't vape it AT ALL. I think it's the rubber insulator cuz there's some burn marks on it. I vaped the same factory head for a couple wks, took it apart to rebuild, no burnt marks. Rebuilt it, taste like ...., and there's burn marks. Ohms are 1.4-2.4, depending on the build. Used 28AWG, 30 AWG, 32 AWG, silica, Ekowool, cotton. What the heck am I doing wrong to get that burnt plastic taste? Anyone know how to stop burning the rubber grommet? I don't get how I can go from great to horrible. Usually u get better, over time, with builds. It's really frustrating me. Shoot me a PM if u want.
I can help with anything else EXCEPT that darn burnt taste, so plz ask about wrapping or whatever.....if u dareTake care, everyone!
Take a look inside the hole the grommet fits in. You will likely see carbon build up. Maybe even some bumpy areas from heavy build up. This stops/hampers conductivity. Poor Ground contact. A small conical wire brush or sandpaper may clean it up. this should stop the Grommet scorching issues.