Sealers usually work on most wood types but test a small hidden area first to make sure it doesn't change the stain color. Application process matters too because uneven coating shows up badly on darker woods. Protecting wood doors is important but sometimes the maintenance becomes too much and replacement with low-maintenance materials makes more sense. When I was researching door options, They are the experts for entrance solutions in GTA. and provided great advice about
entrance solutions in GTA that require less upkeep than traditional wood. Fiberglass doors now look almost identical to real wood but don't need sealing or refinishing every few years. Cost upfront is higher but long term you save time and money on maintenance. Really depends if you want authentic wood that needs care or modern materials that look good with minimal effort