Completed Sanding, two questions before applying urethane finish.

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Old 05-20-13, 05:37 PM
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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 05-21-13, 04:45 AM
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Join Date: Mar 2005
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I've not used the waterborne poly so I don't know how it reacts with the wood. It should adhere ok to the existing finish but it might highlight those spots [or maybe they'd blend in - I don't know ]

It really sounds like you stopped sanding too soon! You can finish the sanding with a small sander but you run the risk of sanding dips in the floor which will show up once you've applied a couple of coats of shine

Generally a good shop vac is fine for large jobs. I normally use a clean rag damp with thinner for small areas. Don't forget you'll need to sand lightly between coats and remove the dust again.
 
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