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I'm having trouble getting the right % of microballons. Was wondering if anyone could help me with a rule of thumb on the % to use. Making a 5 inch swimbait.


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Do you mean micro-balloons as in the white "powder" that can be used to make plastic float???

If so, be advised that micro-balloon are a significant lung irritant (hazard) and should be used with extreme caution.

Personally, I would never use them.

Some info:


...microballoons are borosilicate glass and when inhaled chronically can cause silicosis (permanent scarring of the lungs). I work in the abrasives/grinding industry and have personally viewed ceramic dust under a SEM, and have seen many particles often as small as 1 micron by 4 microns. Hence, your dust mask and/or filter is not removing them. When you sand microballoon filled resin your dust mask is not enough. 

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