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Old 05-20-2013, 06:18 PM  
Dimeron
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Default Completed Sanding, two questions before applying urethane finish.

Hello.

After two days of hardwork, I completed sanding the hardwood floor with the a rented U-Sand. Going to apply the Minwax water based oil modified finish. Not going to stain. However, before I begin I have two questions which I'm still not very sure about.

1. There are some small spots (dents, low areas, edges, corners, etc) where the old Oil polyurethane is still there. I can remove those with my detailed sander and hand held random orbit sander. But there are a lot of those spots, it is time consuming work and I might miss a few. I know it wouldn't look as good, but would there be any issues if the new urethane is applied on top of them?

2. Originally I was going to use tack cloth to wipe clean all the dust once I sweeped and vacuumed, but then I found out tack cloth might leave wax residue behind that will screw up the Urethane. Likewise, Mineral spirit can apparently stained the raw hardwood (and I'm not sure how it will react with the old left over urethane spots). What options do I have to get the last bit of dust out? Would buying bunch of microfiber cloth and wiping the floor with them work?

Thanks.



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Old 05-20-2013, 10:15 PM  
nealtw
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Just use a damp cloth,water. For the dents and scratches, do a small sample area.



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Old 05-20-2013, 10:36 PM  
Dimeron
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I actually tried a damp cloth, it was, not good. It made the bare wood which has been sanded smooth rough up again, and left a visible mark due to expansion of the bare wood when exposed to water. Had to re-sand that area with a 100 grit paper. Do people really use damp cloth with bare wood?

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Old 05-20-2013, 11:10 PM  
nealtw
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You can buy wood conditioner, to wipe the wood so that the rough ends stand up so you can sand them off, as they will stand up when you apply the finish anyway. Before conditioner was on the market, they used water.
http://www.minwax.com/wood-products/preparation/minwax-water-based-prestain-wood-conditioner

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