micro-balloon filler

The instructions suggest using micro-balloon filler for the bow end pour to reduce weight.....could I also use this in the seam fillets for the same benefit?

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RE: micro-balloon filler

The common wisdom on this forum has always been 'no', on account of the reduced strength.  Unless you like taking risks, I'd not use micro-balloons in fillet mix.

That said, as with much common wisdom, I've never seen a shred of evidence to support it.  Someone sometime has probably tested a microballoon-mix joint to failure and proved the hypothesis one way or the other, but I've not seen the report.

I'm sure that a micro-balloon mix is weaker, but experiments show that the fillets are way stronger than the adjacent plywood, so a weaker fillet may have no practical effect on joint strength.

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