I plug a bowling ball which have a gouge in it.Got the color but the plug set up soft to the touch.Is there too much of the other stuff? The guy that I work for told me to try pushing the plunger 3/4 of the way down.

I had that problem once, won't say what material I was using but here's what I think went wrong.

I use small medicine cups to measure on "non-full cup" amounts so I know my mixture was correct. I feel when you use a smaller amount than "full cup" but still use the same amount of color, that the color makes the mixture go nuts. Can't prove it but it's the only time I have ever had a mixture not harden in time or fully cure.

Sounds crazy but as long as the mixture was correct, using smaller cups marked off, wasn't the issue, the room temp was the same as 3 others I was working on, the material was the same as the others what else could it have been ?
IMO if you use a small amount of material, use less color if possible so the mixture hardens correctly.
JMO
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az guy aka: R & L Bowlers Pro
  rlbowlerspro@cox.net

Never guess on your mixture quantities!  When I just need a little plug I use metal measuring spoons.  My plug requires a 3 to 1 ratio, so using a quarteer teaspoon measure gives one teaspoon of the mixture.  Use your pumps to fill the spoon.  If there's any left over I pour it in my "plug cube tray" for later use.  Clean the spoon with a paper towel when finished.  For gouges I use a small plug dam, you know, the ones you never find a use for.  I leave the plug mixture clear and fill in the gouge without drilling it out.  After finishing the work, it is very hard to find where the repair is located.  If you think you have to drill it out, don't go below the coverstock and leave the plug clear.  I've never had one of these repairs fail.  --  JohnP