I bought this a year or two ago and was very impressed so I thought I would give it a quick review. The set I bought has the applicator, filler bottle and the cement, you can get a great little stand to hold it all as well, not sure why I didn't buy it. I must admit I could not fit the applicator into the filler bottle for filling, it seemed to tight which I though was odd so I just cut a pipette down until it fit snug over the glass end and it works perfect for filling exactly as much as you want, I just suck cement out of the bottle until there is about 4 centimeters in the tube then take it off the tube while it's still sucking to break the vacuum, no mess at all. The amount you put in the tube will effect the flow rate slightly but you get the hang of it very quickly. I recently wondered if I was doing something wrong or missed something obvious about the filler bottle being so tight so I decided to ask the the people themselves and I had my answer within 1 business day, this is Aaron's response from Flex-I-file.
"The blue caps that are on the filler bottle are reamed out here at our factory to accept the Touch-N-Flow. Sometimes the blue can is still a little too tight but you can take one of our sanding needles or something else and just work the tip of the blue cap to open in up a little. You don’t want to open it up too much or it will not create a tight seal with the Touch-N-Flow. That may be the case with your filler bottle. Just remember when placing the Touch-N-Flow into the bottle cap grab the Touch-N-Flow about one inch from the bottom and give it a slight twist that will help in inserting the Touch-N-Flow."
Why didn't I think of that, yes it was obvious, I did as Aaron suggested and what do you know, it now fits ok although I still use my cut down pipette most of the time.
The cement will stay in the tube for quite some time when not in use and it's resting horizontal. The cement is very very good and the applicator is a must have tool for me now, it works fantastic on seams as it claims but it's also very handy for other jobs as well. Make sure to practice a little before you start gluing wings together, the angle you hold it at determines the flow rate but after a few minutes you will have the hang of it. Always drag the needle, never push it or it will clog up, if you do get a clog, the cut down pipette will soon clear it but be very careful, not a lot of pressure is needed, dragging the needle across a bit of paper is normally enough to get it flowing again. You will have the odd oops and a bit of cement were it's not wanted but as the instructions say just leave it to dry and you wont have a problem. When your finished for the day just place the needle inside the neck of the bottle and it will empty out in a few seconds, I then drag the needle over some paper towel followed by a quick blow out with the pipette or filler bottle, back into the plastic tube ready for the next session, if you forget about it don't worry it will just evaporate out of the tube. They have a page of instructions and a links to video's here.
Flex-I-File have a host of other tools and gadgets on there website that are very well worth having a look at, when I buy more ill be sure to give my opinion on them.
I love this tool and it's great to use for a lot of gluing jobs. As glues go it's also one of the cheapest as well, even to have it posted to Australia it's not bad for the amount you get per bottle. Highly recommended.