I need advice from a pro floor refinisher regarding a flooring job I did just recently.
Long story short, I sanded a floor with a drum sander and ROS floor sander with no problems.
Done this many times in past.
However, there was a discoloration in the wood that was from an area rug or something from x# of home owners ago. The customer decided to proceed with the finishing for a clear coat.
The regimen I follow for a natural clear coat is shellac as a toner topped with 3 coats of water borne finish.
It looks great – on floors without a problem.
However, the discoloration was even worse under a coat of shellac, so the customer decided to go with a dark stain.
Even after sanding with ROS twice each at 40, 80 and 100 grit there was still enough shellac left to inhibit good stain absorption. I followed through with shellac and clear coat because in hopes the floors would look better.
I opted to not use the drum sander again as I believe the floor had been drum sanded twice before – judging by the look of the rim at the base of the wall.
Customer is not happy with the finish and I can’t say I blame them, but I don’t know what to do to fix it.
I think drum sanding again would be risking the integrity of the tongue and groove construction.
One idea is to sand off the clear coat with ROS, apply shellac and stain to even out the color a little better.
Then shellac and clear coat.
But that would just end up with a light stain on top of a light stain (with shellac in between) in hopes that it will look dark.
I probably should have used the oxalic acid before applying the first coat of shellac, but I have no experience with it.
So if you are a pro-floor refinisher with experience in using oxalic acid would you be so kind as to tell me the ins-outs of using it?
Also, do you have any suggestions on how I might fix this floor?
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