Had an interesting fisheye problem yesterday. On two new wraps epoxy developed fisheyes.Never been a problem before.I realised that the only thing I had changed was to use 2 new syringes.I had purchased a whole bunch of new syringes and on checking the plunger inside the tube I found a coating of some sort of lubricant that was the problem.So Beware and wash out new syringes.

Do you know the manufacturer? Would help us know if we should check.

Thanks!

Thanks - Marc

Keep it simple - that's all I can handle!

Marc these are labelled Made in china 10 for a usd real cheapy`s no manufacturer`s name

Never use off-the-shelf syringes. Those supplied by the finish manufacturers are either free from silicone or do not contain the rubber plungers (U-40).

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Thanks!

Medical syringes are typically always lubricated with silicone. Stick with those that are provided by rod building companies and be assured that they will always be reasonably contaminent free

A very common problem with syringes that are made for uses other then rod building!

I use em all the time, you just have to rinse them in flex coat brush cleaner, then pull up some alcohol and wipe them dry.

Dennis J. Danku
(Sayreville,NJ)

will have ti try that one to see if it works thanks Bill

William Sidney
AK

I eliminated the syringes altogether. I weigh the mixture on a small digital scale. I've found 3cc's of hardener and 3cc's of resin weigh the same amount, repeatedly. It's a quick process, there's no sticky mess, and it's drop-dead accurate.

You may wish to check your weights again - generally the two parts don't weigh the same, although the particular brand you use might.

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Tom Kirkman Wrote:
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> You may wish to check your weights again -
> generally the two parts don't weigh the same,
> although the particular brand you use might.
>
> .................

No, they don't. 3cc's of a given hardener weighs "x" grains. 3cc's of a given resin resin weighs"x" grains.

Not according to the manufacturers of the epoxy. For instance, 4 ounces each (volume) of one of the most popular epoxies has a resin weight of 5.56 ounces and a hardener weight of 4.82 ounces. Measuring smaller portions would minimize the difference, of course, but there remains a difference.

If you're sure that the brand you use possess identical weights by volume, that's fine. But I'd suggest anyone wanting to go to the extra trouble of weighing the parts might want to first check the weights of the particular epoxy they're using. Better safe than sorry.

Just for kicks, trying measuring larger quantities - several ounces of each and see what your findings are.

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Edited 1 time(s). Last edit at 01/15/2016 11:05AM by Tom Kirkman.

And you will save time when using the syringes I use the same ones for years

Bill - willierods.com

Tom is correct, they do weigh different amounts even if the volumes are equal. Years back I weighed a couple of different brands of thread finish, 3 different ones to be exact. I cannot remember exactly what the difference was, and they were all slightly different from each other too, but it was roughly a 10% to 15% difference between the two parts. Thats quite a bit when only mixing up 3cc of each.

Sorry if I went against the grain here, didn't intend to ruffle any feathers.

Jay,
The manufacturers of the epoxy finishes have the volume verses weight readily available.
Just give them a call and they will generally share the information directly.

It is very common for folks that are mixing large batches of epoxy to use a scale for measuring. But for rod finish - which normally employ rather small volumes, it is so simple to use volume for mixing rather than a scale.

Another nice thing about using the syringes, is that there is nothing to clean up, except a mixing stick when mixing this way. No need to ever clean the syringes, just use a paper towel to wipe off your mixing device and you are set for the next batch.

Good luck

Jay
If it is working for you what the hay It is just not usually done posts of people doing it have had bad results Not Drying

Bill - willierods.com

You didn't ruffle any feathers. My point is simply that there is a difference in the weights by volume of the resin and hardeners of most popular epoxies. If what you're doing is working for you, great. But others wanting to try it need to measure/weigh their particular epoxy just to be sure. This is on the advice of the people who make most of the rod building epoxies.

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You didn't ruffle my feathers either, just trying to save you and other builders some misery down the road.