Is It Possible To Use Outside Wood Sealer Indoors?

Linseed oil and tung oil are the foundation for hand-rubbed oil finishes, which have been used for centuries to beautify and protect dark-grained woods like walnut and mahogany. These oils are all-natural and can be used for both indoor and outdoor use.

Interior stains are designed for indoor use, while outdoor stains are specifically formulated with protection from sunlight and moisture in mind. Deck stain should not be used indoors as it contains chemicals not suitable for indoor use and could cause health issues. Water-based polyurethane is suitable for interior wooden surfaces, while oil-based or exterior polyurethane is suitable for exterior surfaces. Exterior polyurethane has extra additives that make its finish UV-resistant.

There are various types of wood sealers available, including water-based polyurethane for interior wooden surfaces and oil-based or exterior polyurethane for exterior surfaces. Outdoor topcoats are formulated to add UV inhibitors and are more flexible. While some people argue that exterior stain indoors is harmful due to chemicals, this article suggests that it is not harmful.

Exterior wood stain is designed for outdoor use only, and the chemical makeup is much different than an interior stain. Outdoor stains can be used for indoor applications, but it is generally not a good idea to use an indoor stain outdoors. For example, I used decking stain on my internal wooden floors four years ago and it still looks strong, although some wear is evident in high foot flow areas like the kitchen.