QUOTE: Originally posted by traskos
I left the cover off a bottle of Tenax 7R and the next day the bottle was empty. Glues would have hardened up in the bottle
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Been there done that... I got one of those pens and they're good. My instructions said to drop the top of the pen into the liquid, allow it to rise to the level of the bottle, then turn it over to allow the liquid to flow down to the needle tip. It also said to drag the tip so that the opening is to the rear, do not push it forward or you may inadvertently clog the end with melted plastic. If you don't use all of the glue at once, it recommended that you lay the pen flat to prevent it from dripping. I use compressed air when I'm finished and blow any excess into a paper towel when I'm done.
There was one more warning that should be a no brainer, but I caught myself almost doing it. "Don't put the pen in your mouth." I caught myself doing this when I was trying to shift the piece I was working on to another position to continue gluing.
In any case, I thought it was well worth the price and recommend it for job that requires precise bonding.
Don