The property you are considering buying has the potential to make you a lot of money. Only it has one major problem, and this problem is the reason you are able to buy this property at such a bargain. The problem is odor, odor left behind by a host of pets.
Should you seal or paint the floors and walls to trap the odors? Will that solve the problem for you? Unfortunately, the answer is no.
Sealers are intended to block stains on walls from bleeding through and staining new paint applied to a wall. They are not designed to seal or block gases (odors) from escaping or passing through. Some-but not most-paints do produce a continuous membrane finish that is not gas permeable. Consider, however, that only one of many sides of an object like a piece of drywall or flooring is being painted, this approach offers limited odor control and success.
Both fire and tobacco smoke are exceptions. But even long-term contamination of walls and ceilings with tobacco smoke can be sealed in only after most of the tobacco tars have been washed away with Tri-Sodium Phosphate (TSP). The remaining tobacco smoke odor can be eliminated with chlorine dioxide gas. It is a small packet of powders that when exposed to water vapor, produces a gas called chlorine dioxide. This gas oxidizes the smoke residue and removes the odor completely in as little as 24 to 48 hours.