Many years ago, I installed a countertop & treated it with Ikea's Behandla oil. I see that the current Behandla is listed as "glazing paint" and has a tint. I want to sand out & refinish a couple of spots on the counter. Do I have to remove all the existing finish & start from scratch? I also have an unfinished table I would like to treat to match (not exact match, but similar). What would be the best alternative?