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Yes, limestone often turns yellow over time when improperly cared for. The stone contains natural iron deposits, which can oxidize when exposed to water, acids, or harsh chemicals, such as bleach. Without exposure to water or chemicals, limestone should not turn yellow. Always seal limestone countertops to protect them from moisture, and only use gentle cleansers designed for stone.

Buffing is a less expensive and less time-consuming alternative to other floor repair techniques, but it’s only ideal for removing surface-level scratches and damages. Floor-buffing machines work to gently smooth out the floor’s top layer rather than removing it the way that sanding does. 

This process is ideal for gently worn floors, but it won’t have the desired impact on floors with severe damage. On the other hand, sanding fully strips the floor’s top layer so damages beneath the surface are accessible to remove or repair. Since the process is more involved, it requires more time, tools, and experience to achieve the best possible results.

The answer to this question depends on how large the room is and how much experience you have stripping and waxing floors. It will take at least 24 hours to strip the floors, then you must allow time for drying, waxing, waiting for them to cure, and, finally, buffing them. Since you likely will not be working for the full 24 hours, it is safe to say that this is a two- or three-day job.

A water-based, low- or no-VOC sealer is typically a good choice for marble countertops. Choose a sealant that is certified safe for contact with food when applying to kitchen countertops. For high-traffic areas, look for formulas that have heat-resistant and acid-resistant features. While there are economical and convenient spray-on sealers, they don’t coat the surface as effectively as the ones you apply with a pad or brush.