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CARDBOARD acts like a sponge and it soaks up all the resin and powders in the bondo, and thats the stuff that makes bondo water proof, easy to sling, taking away to spread it on easier as well
not to mention cardboard/wood acts like a spring as well absorbing the impact of your hand and mixing it=FAIL!!
mixing on metal nothing happens to the product, the bondo retains all resin and powder in it, no problems, a good tech will always mix on metal, if you ever see someone mix on cardboard and it leaves a stain or mark, its the material i just listed left from mixing on cardboard
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