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IN BRIEF
MDF routed doors
A routed MDF door should be evaluated after the intended finish and hardware are applied. Choose the deepest or most demanding profile and keep the preparation sequence with the result.
- Inspect the profile before and after coating.
- Record the sealer and finish system used.
- Keep the complete door and hardware fit in the trial.
UNDERSTAND THE DETAIL
Why can painted MDF edges look different from the face?
Routing exposes material within the board, and the resulting profile can behave differently from the smooth broad face during finishing. MDF industry guidance treats edge preparation as a distinct part of coating work. Examine the routed profile and the face together when assessing the finish.
Use the coating manufacturer’s compatible preparation, primer and topcoat instructions. Keep the exact products and application sequence on the sample record. A successful coat on a flat offcut does not show whether a deep groove, inside corner or machined edge will give the same appearance.
- Before coating
- Review machining marks, loose fibres and the profile shape on the trial piece.
- After preparation
- Check whether the intended edge treatment gives a suitable surface for the selected system.
- After finishing
- Inspect the cured face, recesses and edges under the agreed viewing conditions.
Is there one sanding grit or primer for every MDF door?
The appropriate sequence depends on the board, machining quality, coating system and required finish. Agree it with the workshop and coating supplier, then retain the successful sample. If the profile or board changes, repeat the affected part of the trial rather than assuming the same settings will produce the same result.
Continue with storage and process readiness before finishing.
Reference: EPF: lacquer finishes on MDF.
Choose a profile that represents production
Use the current drawing, including the narrowest detail and relevant recesses. Record the panel item and machining revision so the sample can be reproduced. A flat painted swatch does not reveal the appearance of the routed edge or the completed door.
The European Panel Federation’s edge-finishing guidance addresses cutting quality, sanding, sealing and compatibility of the finish system. Use the selected coating supplier’s instructions to develop the actual process; do not replace them with an unverified mixture or generic coating schedule.
Keep the process record short and repeatable
Record the condition after machining, the preparation performed and the coating references. Note the stage at which an unwanted mark first appears. A visible line in the final finish is easier to discuss when the earlier surface observations are available.
When changing the board, sealer or profile, label the revised sample. Compare it under the same viewing conditions and against the same door drawing. Retain the complete accepted sequence so a successful coating result can be connected to a repeatable production instruction.
WORKED BUYING EXAMPLE
Example: compare a routed edge with a flat face
Illustrative planning example; values and quantities are not product specifications or quotations.
A workshop is developing a painted door with a recessed profile. The flat face looks acceptable, while the first coated profile needs review.
Scroll horizontally to compare all columns.
| Item or observation | Record or compare | Next decision |
|---|---|---|
| After machining | Photograph the profile and mark any tool lines. | Review the machining observation before coating conceals it. |
| After preparation | Record sanding and sealer references. | Keep preparation changes identifiable between samples. |
| Completed door | Inspect the profile, face, reverse and hardware fit. | Approve the full process only after the required component checks. |
What this means for the order
Compare the amount of preparation as well as the final appearance. If a revised construction reduces rework, keep the measurements, photographs and processing times from the same profile and finish trial when discussing its price and production use.
Keep these details with your inquiry
- Door drawing and critical profile detail.
- MDF item and sample code.
- Preparation, sealer and coating references.
- Stage photographs, complete-door result and accepted process revision.
Review the relevant product guide and prepare your inquiry files.
Questions buyers ask
Why include the reverse face?
The order describes a complete door. Its reverse finish, machining and fitting arrangement should be included in the sample scope rather than left undefined.
Should a new colour trigger another trial?
Discuss the changed finish with its supplier and identify which earlier results still apply. Evaluate the detail needed to resolve the effect of the changed system.
