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mkgcb12 t1_iskpphu wrote

I'm am far from a professional so take whatever I say with mounds of salt. Those lines are caused by the natural shrinkage of the boards and the way they were milled. If you want a smooth flat surface you'd be best off removing the board (which will save your sand paper too, as it looks like you're destroying those stainless steel deck screws $$$) and sending it through a planer. Is your deck pine?

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shoziku t1_iskvbp9 wrote

To me they look like normal "hills and valleys", or ripples. You have to sand the hills down to the valleys to even it out. Test it out by running a pencil line perpendicular to the "lines", then sand again and see if the valleys still show the pencil mark.

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kittenfordinner t1_isl911o wrote

countersink. those screws, you can get a drum type floor sander, be aware that you are blowing copious amounts of poisonous treated timber dust around. Also, why are you sanding a deck?

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Sluisifer t1_islino1 wrote

The lines are mill marks. They were already there, you just didn't notice. If you sand enough, they'll go away.

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daveb814 t1_islltov wrote

As others have said, those are high and low spots. If the lines were from the sander, they would all be the lighter color, not dark and light. Put some 60 grit on and take your time. After everything is smooth, switch your way to 80 than 100.

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AsianAssHitlerHair OP t1_isllueh wrote

Replying to Sluisifer (#119,182)

Thanks. I was worried because at first the extension cord I was using was not supplying enough electricity and it was clearly affecting the speed of the machine. Was worried. That could have been the cause

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Wellcraft19 t1_isn1z3x wrote

I sand my deck every two years. It’s a pure joy to bring it back to ‘new’. I use a cheap Harbor Freight orbital sander after the Ryobi decided to give up years ago. Have had zero issues. A 12x16 deck takes about 90 minutes. The very first time though, after deck had ‘aged’ for 4 years, it took a few hours more. Doing it every two years provides for a nice and beautiful surface, easy to oil to bring out the colors.

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