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Internal Doors - The Best Way To Treat Your New Doors

How to Treat Your Newly Delivered Internal Doors

oak internal doors selection

If you have purchased unfinished doors, it is essential that our customers treat their newly delivered internal doors before they are fitted. This gives the doors the best possible level of protection and allows our customers to achieve their desired look. Your warranty may be void if this is not done!

It’s also extremely important that you care for your doors before they are treated and fitted. Packaging, storage, treatment and maintenance are all vital in ensuring your doors will stand the test of time.

Inspecting Your New Internal Doors

When your doors have been delivered, please be sure to check them over thoroughly. Problems are very rare but it’s always best to inspect them immediately so that you know they are ready for treating and fitting. Doors are well protected and should be re-sealed after inspection to keep them safe.

The packaging stops any moisture in the air from penetrating the untreated wood, particularly important if your doors will be sat for a considerable length of time. Leaving doors exposed to moisture can cause the water to be sealed in when they are treated and could eventually cause warping as it gradually dries.

Storing Your Oak Internal Doors

One of the most common mistakes which people make when storing new doors is standing them up against a wall as it takes up less room. The issue with this is that doors have a considerable weight which should only ever be stressed across their structure entirely vertically or horizontally. Leaning a door against a wall can cause it to bend slightly and also poses a significant risk of the door falling which could of course be very dangerous.


If it is necessary to store you new doors before treating and fitting, they must be kept on a dry, flat floor. Untreated internal oak doors must be stored in a dry room which is free from any damp. This also means you should avoid storing them in recently plastered rooms as the moisture leaves the walls and is absorbed by the room’s atmosphere and contents.

We supply our interior doors unfinished to give our customers the opportunity to choose the finish they prefer, this does however mean they are susceptible to moisture absorption so please ensure your doors are well protected before being treated.

Treating Your Internal Doors

Treating your internal doors gives you the opportunity to match them with existing features to create a consistent look throughout a room. An alternative option is to use the beautiful wood door as a feature itself by breaking up a room with a single colour finish.

We suggest using a hardwax oil as they provide fantastic endurance and smoothness to your doors. We highly recommend using our Treatex range because from experience, it offers an excellent surface finish and is also extremely effective at keeping moisture out and protecting your doors over time.

We highly recommend using Treatex Hardwax Oil.

You Will Need . . .

Sanding Pads
Safety Goggles & Safety Mask
Latex or Safety Gloves
Micro Fiber Cloth or Tack Cloth
Varnish Paint Brush or Lint Free Cloths
Treatment Oil (We recommend Treatex or Osmo)
Masking Tape - For Glazed Doors & Door Knobs
Dust Sheets
Fine Wire Wool

Treating Your Newly Delivered Doors

  1. Ensure your working area is very well ventilated both before and after treating your doors.
  2. If you are treating a glazed internal door, ensure that you mask off any glazing with your masking tape.
  3. Either remove or mask off any door furniture.
  4. Our doors are supplied pre-sanded but it may be necessary for you to buff over any uneven areas which may have been created when you cut into the wood for the hinges and handles etc.
  5. Thoroughly wipe away dust using your micro fiber cloth before using a damp, lint free cloth to remove any remaining sawdust.
  6. Make absolutely sure that the door you are about to treat is clean, dry and entirely free of any dampness or moisture.
  7. We highly recommend that you use either a Treatex or Osmo internal oil to treat your internal doors.
  8. Ensure that the oil is stirred thoroughly before use and with a flat brush, the treatment should be applied evenly following the direction of the fibres.
  9. Oils should not be applied in temperatures less than 5 degrees Celsius or in blazing sunlight.
  10. The drying time is dependent on the product you choose to use when treating your internal doors. For example, a coat of Osmo Polyx Oil Clear Satin will take approximately 8-10 hours to dry whilst Treatex Hardwax Oil Medium Oak is quick drying and allows for two coats in 3-6 hours.
  11. For the recommended number of coats required, please read the manufacturer’s instructions as it will vary depending on the product and the desired finish.
  12. Be sure to treat your internal doors thoroughly and seal inside lock cut outs, behind hinges and also the sides, top and bottom to ensure the door is well protected.
  13. It may be necessary to lightly rub down any uneven areas with wire wool after the first or second coat has been applied to the door and has dried.