However if you go away and don't use the stove for a week you will notice the loss
The rubber gasket
should stop this. We've no problem with ours and the alcohol doesn't evaporate with them in place. If you have lost
them I've heard good substitutes can be made out of those silicon pads used for sticking hot pots on (the name of these things escapes me at the moment).
BTW the first mate loves her Origo
- a lot of alcohol stoves have a bad rep for cooking
steaks (not hot enough) but the Origos do a wonderful job.