: I find however that if you are using them to inject into
: bubbles the injection needles work better. There are several different
: sizes. Someone was saying to cut the needle off with wire cutters then
: hone the end flat on a stone. That is fine but unnecessary. Use a larger
: needle. I have tried 23 gauge, 21 gauge and 20 gauge. The lower the number
: the larger the needle (like a shotgun). If you get a 20 ga. needle you
: should have no problems with getting flow through the needle. Plus, the
: sharp tip cuts out the step of having to place a hole for the needle
: first. The sharp needle does this itself. One last thing. if you can, get
: long needles. I found that it is easier to get resin into long bubbles by
: setting the needle far in and withdrawing it when the areas are filled.

: just some suggestions...

good suggestions:
but what i am talking about is not making such large holes as the needle size in the hundreds of bubbles i had, but just pricking the bubble at each end and placing a blunttipped needle hard against the outside of the glass and forcing the epoxy in with the air escaping out the other end - not pushing in the needle. i also have lots of long bubbles that i couldn't push a needle far into anyway - thats where this originated.

as far as flow rate is concerned, after 1/2 hr continuous squeezing(for panel gluing - different application), my strong guess is that shorter is easier. could be wrong