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As long as you do it carefully, you can sand and restain hollow core doors. However, it’s risky because the veneers on hollow core doors are so thin that sanding and restaining might cause damage to the doors. If you do move forward with this project, sand the doors lightly with a medium-grit sandpaper.

When choosing a door for the space between your garage and house, steel is your best bet for fire safety. While wood—and sometimes glass—doors are common, they have lower fire-ratings. Fire-rated steel doors can withstand flames for up to three hours—double what wood can manage (90 minutes). Glass, while non-combustible, can crack under extreme heat. Steel may cost more, but it also offers the best protection. Steel isn’t the most aesthetically pleasing choice, but as long as your door meets the International Residential Code (IRC) standards, it’ll do its job in protecting your family and home.

Solid wood is a durable and attractive option for cabinet doors that holds up well against a small amount of moisture. However, solid wood doors will expand and contract, meaning upkeep will be necessary if painted. Particleboard with veneer cabinet doors are cost-effective and can be attractive. MDF cabinet doors offer excellent and predictable workability features. However, both of those options are vulnerable to damage if water finds its way through the veneer or paint finish. 

If you want to let in plenty of sunlight while keeping your home well insulated, your best bet is a patio-style door with two doors with full-view windows, including one primary door and one secondary door behind it, such as a screen door or storm door. This two-door system will let in plenty of natural light while maximizing insulation.