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Exterior decks are not supposed to have nails punched. Was told it has to do with water pooling in the holes and increasing the chance of rotting boards. I coilnailed my deck with s/steel dome headed nails. IT had been down for some time and started to turn a llight grey colour. Just went to bunnings, hired the floor sander with 60 grit and went over the lot. Any nails that were slightly protuding i hit with a hammer but the sander just flew over the others. Any nails that were a bit proud now have a flat head. Came up great with 3 coats of intergrain ultradeck.
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I punched and puttied my merbau. Looks great.
