i mostly use the SI blank carts when vaping. i have about 20 different flavors of juice so far that i vape (from different vendors). now i have noticed and im wondering if YOU have too that my SI blanks carts after ive been re-filling them start to i assume they are maybe getting clogged up with juice residue and the get harder to get a good vape from or/and the juice flavor starts to taste kinda nasty or kinda dark/burnt flavor? is this normal for carts even in general? i read that we should be able to use and re-fill carts over and over for quite a lot of times, but im sure there is a limit to how many times i can re-fill a cart before it either just dies or it gets burnt or becomes less vapable or something. i have also previously boiled out carts and have also used the plunger flushing method to clean out my used carts , but still after awhile of re-using them that they got all weirded out on me for some reason? they start to taste kinda dirty or they get hard to get a good draw from compared to a fresher newer cart. PLEASE give me your experienced opinion on this? i hate to have to buy new blanks carts a lot more regularly. i also use the T3 tanks alot now which im liking, but i wanna continue using SI carts when i am out and about town.
What happens is that the sugars burn up and form a big clump of stubborn, hard, crusty carbon crud around the tiny coil (kind of like the stuff you get when you bake something sweet and it drips down into your oven). When that clump becomes big enough, it will keep e-liquid from accessing the coil to create vapor and/or block the air tube. The carto will also get really hot around the coil. How long it takes for this crud BB to form depends a lot on the juice.
There's really no good way to get rid of the clump, except to thoroughly clean, let completely dry and dry-burn the carto (carefully, very short bursts till you see orange through the air tube, and no more than that), then clean and let completely dry again - only problem with this is that there's a very good chance that you'll singe the filler; then there will be no way to get rid of the burnt taste and it's basically toast. But if you
don't singe the filler, that's more life out of a disposable carto that's living on borrowed time anyway. Of course, dry-burns are a piece of cake on clearos, where there's no filler.
When you're still getting good performance but the flavor is meh, then simply cleaning and completely letting dry would probably be enough to bring it back to life. I keep a lidded jar of cleaner of your choice (water, vodka, denture tabs, whatever you wanna use - even Dawn, but it's a PITA to rinse off) next to the sink and drop my spent cartos in there, to give it time to soak before the next cleaning. Soaking does nothing to loosen the crud around the coil where the metal wire is wrapped, but it does pretty good at cleaning the ends, exposing some wick.