We've always loved the white painted floors that are especially prominent on Scandinavian design blogs and magazines, like these from the home of Danish stylist Sidsel Zachariassen. We wondered what the secret is to making them both pristine and durable. We found the answer in a Dwell slideshow about the smart, frugal renovation of a small two-bedroom apartment by two very clever Finnish designers who weren't afraid to d-i-themselves. 'It took Susanna several layers of sanding—and then finally tossing her water-based paint and selecting the proper oil-based formula—to get the floor as white as she'd envisioned. But she couldn't be