1、If the substrate has not been damaged, consider applying paint directly.
The correct procedure is as follows: First, sand the existing wooden door thoroughly. Then, apply the primer and topcoat directly. This is because most finished doors have a wax finish, which can create a layer of oil on the surface. Sanding removes this layer, improving the adhesion of the paint. Refinishing and the initial coat of paint have the same quality, so there is no need to worry about a shorter lifespan or other issues.
2. If the substrate is only slightly damaged, consider using Atom Grey putty powder to fill the gaps and then apply a fresh coat of paint.
The correct procedure is as follows: Clean the large-core door opening and surrounding areas, ensuring they are clean and dry. Then, lightly sand the surface, and apply the prepared atomic putty powder to the sanded surface. If a thicker coating is desired, apply in multiple thin coats until the desired thickness is achieved. The optimal wet grinding time is typically 0.5-1 hour after applying the putty powder, and the optimal dry grinding time is 2-3 hours. After grinding, remove any surface dust and proceed with subsequent operations such as applying primer, topcoat, or clear coat.
3. If the substrate is significantly damaged, consider using small wood blocks to fill the gaps.
The correct procedure is as follows: Use a piece of wood cut to the same size as the hole to fill it. Apply a ready-mixed putty paste mixed with a light-colored filler, such as wood powder, to the hole. Apply and sand until the surface is smooth. This initial filling is crucial. Then, apply several coats of self-priming paint that matches the door's color, and the job is complete.
4. If the substrate is severely damaged and the large coreboard has large openings, it is recommended to discard the old material and purchase new material.