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I'm about to replace baseboard, doors, etc. I'm keeping several of the door frames, which are varnished. I have a 5" R.O. sander. What grit count(s) should I use to get the best results? Any pointers or warnings also appreciated.

Also, afterwards...1 coat primer then a good semi-gloss paint?

Thanks!
 

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Rubbin walls since'79
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If you're prepping them to prime/ paint them, i wouldnt use the power sander. All you need to do is dull the finish enough so that the primer has something to grab on to. And you don't want sanding scratches to show through. 150- 220 would work fine- i would use a sponge with fine grit.

Use a bonding primer- I'm liking Zinnser 123+ ( same as Smart Prime) , or reg 123
 
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