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Old 08-25-2019, 11:00 AM
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Sundancefisher Sundancefisher is offline
Join Date: Jan 2008
Location: Calgary Perchdance
Posts: 15,709

Originally Posted by walking buffalo View Post
I'm still confused on pertinent details.

To confirm, this is a floor that was NOT newly refinished, just covered to protect from other renovations? Correct

Most importantly, what is the finish on the floor? Older style oil based coating

Some finished can be buffed and recoated, others can't.

To answer your question, the type of existing finish must be determined.

Assuming the floor was not newly finished, the tape should not have lifted the finish if it was in good shape. This means there are problems with the existing finish and the bond to the wood. This sounds like it was neither the contractors nor 3M's fault.
The tape may have lifted the finish after even a couple of days.
The fault fully lies with an old finish that has decomposed.
The contractors should not be held responsible for the damage.

Recoating over this could cause even more problems.
While the new coat may bond well to the existing finish, there is a significant chance that blisters will grow wherever the old finish and wood are no longer well bonded.

I'm actually fixing this exact problem for a client right now.
A fir floor with Spar varnish reapplied to an old Spar varnish finish.
Blisters are growing wherever the old finish had pin holes to the wood.
In this case, the best solution is a full sand, stain and recoat.
Good notes. 3M said to the contractor that the tape used should not be left longer than 5 days as the glue cures over time, changes the adhesive properties and can bond more.

This is likely the old oil based product however the guy that looked and though a buff and reapplication thought the floor was in great shape.

This would be the first ever sanding done since the hardwood was applied he figured.

Is the new water based product just as good as the old oil based product? Can you apply the water based product over top of an oil based product?
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