Home Doors How to respray a composite door

How to respray a composite door

The rapidly growing market for composite door respraying is a prime opportunity for window installers with the know-how to take advantage. Here, Guy Hubble, Joint MD at RegaLead, talks us through the process of respraying a composite door.

With more than 3 million composites in the UK now over five years old and most still mechanically sound, more and more homeowners are choosing to renovate rather than replace. The cost of living crisis and high interest rates, combined with increased costs for replacement doors, is leading to more and more homeowners choosing to opt for a respray for a home improvement quick-win – adding maximum kerb appeal at a much lower cost.

There’s two methods of respraying a composite door. The first involves removing the full sash and painting the door on trestles, which is a one person job. The second method, which we are showing here, involves leaving the sash in place, masking up the necessary areas, and painting the door in situ, which is ideally a job for two.

Here’s what you’ll need

  • Paint: Good quality 2K PU paint. RegaLead Colorspray PVC, Fenecoat or GRP.
  • Masking: High strength masking tape (J Tape Orange), 3M M3000 Hand Masker and masking paper (available from most decorators merchants or Amazon).
  • Cleaning: ColorSpray SB400 Prep clean and Maroon Scotch Brite pads.
  • Equipment: We recommend a compressor and gravity fed pot gun. The size of the compressor needed will be dependent on your spray gun. We recommend the Sata Mini Jet as it has low air consumption so can be partnered with a small 25L compressor.
  • 25L Nuair Compressor
  • SATA Minijet 4400 B HVLP 1.2 S
  • Water/Oil Trap & Pressure Regulator
  • All necessary fixtures, fittings and 10m hose

Preparing the door

Decorators will tell you that the key to a quality finish is all in the prep and it’s no different when it comes to spray paint. It’s important that the door is cleaned and prepped properly as it may have been in situ for years and will likely be heavily contaminated on the surface.

Before prepping, remove all the door furniture and hardware including handles, letter plates, and drip bars. If the frame is also being painted, then remove the silicone around the frame.

As well as a thorough clean with soapy water to remove the obvious surface contamination, doors should be thoroughly rubbed down with a quality ‘prep- clean’ such as ColorSpray SB400 from RegaLead. We recommend that this is rubbed on with a 3M Maroon Scotch-Brite pad or similar grade abrasive pad.

As well as helping to remove surface contamination, the ‘prep-clean’ will change the properties of the existing paint surface, ensuring that the new paint will key better and give the long-term performance needed.


As with all spray paints, regardless of the equipment being used, there is always an amount of overspray which adjacent surfaces need to be protected from. The Sata MiniJet 4400 that we recommend benefits from a tight fan pattern, being originally developed for the automotive smart repair market.

1: Mask the edge band of the door with a high strength masking tape such as J Tape Orange.

2: Mask off the glass (or the apertures if the glass has been removed) using a combination of masking paper and tapes

3: Finally, mask off the frame and surrounding brickwork up to 200mm from the door using paper and masking tape. The 3M M300 hand mask is a great tool for this type of masking

The painting process 

4: When using 2K paints it is advisable to add the Hardener just before spraying. We always recommend a test spray on paper to check the gun is set up correctly and the colour is as expected.

5: Start by painting the perimeter of the door (#1 on the diagram), followed by the cassettes and mouldings (#2), with a dust coat. Finally, paint the door with a full coat weight, starting at the top and moving from side to side (#3), with 50% overlap on each pass.

6: If an extra coat is required, spray another full weight coat, again going from top to bottom with a 50% overlap.

7: Dependant on the amount of coating applied, temperature, and humidity, the paint should be touch dry and the door able to close in the following times:

  • PVC/Fenecoat: 45mins – 2 hours
  • GRP: 1 – 3 hours

Find out more at www.colorspraynetwork.co.uk

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