Why is it not advisable for you to use cardboard as a mixing board filler?
What will be an ideal response?
It is porous and contains waxes for waterproofing. These waxes will be dissolved in the mixed filler and cause poor bonding. Cardboard also absorbs some of the chemicals in the filler and hardener, slightly changing the filler's curing quality. Cardboard fibers can also stick in the filler and ruin the finish.
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