Why Cyanoacrylate Instant Glue Spouts "Clog"
by Wood Finish Supply & courtesy of Satellite City.
Makers of "HOT STUFF" and "UFO" Industrial Grade Cyanoacrylate INSTANT GLUES.

This text deals with the clogging of delivery spouts.
If you have problems with colgged spouts, please read on.

Some Causes of Spout Clogging:
Background: The key word is "INSTANT", which, for our purposes means it will cure rapidly if given any incentive. This characteristic is, after all one of the reasons you use these glues. The curing incentives that the user inadvertently provides at the spout tip causes clogging. There are many such incentives listed below that might be the causing the clogging you may be experiencing.

New, Unopened containers of any instant glue may be stored in the freezer (at or below
32 F) to double shelf life. Always allow the container to warm to room temperature before opening. Once opened, never return an opened bottle to cold storage. Why ? -- Moisture is one of the catalysts. Opening a cold bottle or placing a previously opened bottle back in cold storage causes the warm air that has entered the bottle, (carrying moisture with it), to condense the moisture into water. This has a negative effect on shelf life causing the contents of the bottle to thicken and eventually harden and causes the spout to clog very frequently. The thicker these glues become, from the original viscosity, the more frequently clogs occur.
Note: This is not to say that the gap filling versions are more likely to clog.

Keep the tip of the spout from touching the work, especially if dust, from sanding, is present. Each time the spout touches foreign matter, the glue is effectively being told to cure. Foreign matter, if sucked into the spout, can also cause the contents of the bottle to thicken and eventually harden.

If an overcap is provided, use it to reseal the bottle between uses. The overcap prevents dust or accelerator overspray etc. from settling on the spout. Never wipe off the spout tip with anything. Lint from cloth or paper products sticks to the tip and causes clogging. If you have a problem with clogging overnight or over the course of several days, here is a Special Note Regarding "HOT STUFF" glues. If our special sealing ring (located 3/8" down from the tip of an unoppened spout) has not been trimmed off, try tipping the bottle and squeezing slightly to fill the spout with glue. As the beginning of a drop appears ready to come out, snap the overcap in place. Then store the bottle upsidedown and your spout will remain unclogged, ready to use up to several weeks.

Always make sure that accelerator OVERSPRAY does Not touch an exposed spout.
Set glue aside or reseal with the overcap before spraying accelerator.

Avoid putting pins or nails or anything into spout to try to keep it clear. The trace moisture on these objects is carried into the spout and makes clogging more frequent. Instead, trim off the tip a little with a knife.

6) AGE or Foreign Matter:
Shelf life is determined, to a great extent, by the quantity in the container. As a rule of thumb, a two ounce bottle has a one year shelf life at room temperature. As the bottle ages and passes the expected useful lifetime, it begins to thicken. This can also occur because of improper storage or because of foreign matter being introduced into the bottle, as explained above. If you are very familiar with these glues, you know that even glue thickened because of any of the reasons above, is still usable as if it were gap filling versions. NEVER add new glue to an open bottle as the older glue will shorten the shelf life of the new. Large bottles of glue are poor economy unless a smaller container is used up entirely within 4 weeks.

Replacement spouts are available for most glues. It is always a good idea to have an extra on hand for those times when you have accidentally ruined the current working spout.

end: Hot Stuff Spout Tip Sheet - rev.2 - 9/7/95
Wood Finish Supply

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