About the size of a rice grain is all you need. I use the silicone lid for wax. It does gum things up faster than flower, but it shouldn't overflow into the oven at all. Just swab out the airway, clean the can and mouthpiece, and you're ready to go again.
Yeah,
@CalyxSmokr , maybe the person who said 3/4 of the way full was very high when s/he wrote that (
)because i do not see how you can fill that full and NOT boil over. I mean, the lids help, but if they can leak when you tip them, certainly they can boil over. Even when I am careful and use tiny amounts, the whole can and lid (but not oven unless I tip it) have residue all over, so the oil is bubbling around in the can when hot. Try it with smaller amounts, start with large grain of rice, see how that does and then work your way up. If I tilt mine with that small amount, it still spills. The new lids are better, but the cans still have holes and seams so there is no way for them to be leak-proof.
It is not ideal, I know, but I am not sure a) that any other portable device short of one with a fully enclosed chamber (which means more chamber cleaning) can boast of no leaks without b) using some sort of sandwich either with flower or a concentrate pad of some sort. I know my brother-in-law uses the mini steel wool pad in his mighty when he does concentrate in it.
You might, if you do not want to sandwich with flower AND do not want to use less than pea size, try buying some degummed hemp fiber to top your concentrate. I read somewhere that people prefer that to cotton when vaping concentrate with a "pad". I think
@stickstones might have said that, actually.
Please do report back your findings because I would love to know if this works for you or if you get fed up with it, either way. I seem to be the only one experiencing leaking with the new lids, I guess, since no one has ever responded to my query in this thread. It was nice to see I am not alone.
I do not use, nor do I want to, a lot of concentrates, but on occasion I do. The flavor of some is amazing...only in the Haze. I think I give up on dab rigs and pens for concentrate. ONLY the Haze delivers a smooth, flavorful hit for me. However, the leaky lids makes it much less convenient to port a filled device since most often I have to CARRY my Haze with the cans in the leaking position. I really cannot risk leaks into my school bag or pocket. Yuck. Therefore, I only do concentrates in the Haze at home, or, sadly, transformed into liquid in my pen for extra stealth.