How to Paint Fiberglass Windows

A car with fiberglass windows.
What You'll Need
Epoxy paint
Fine wet sandpaper
High-volume low-pressure spray gun
Paint filters
Paint stirrers
Nose filters
Eye and hand gloves
Rag cloth

Fiberglass windows are ideal for getting better insulation; moreover, fiberglass is more reliable than any other material. These windows also provide other benefits when compared with wood which would bend and warp due to changes in the weather conditions. But even then, it is not most commonly used because there is a limitation in the color of the fiberglass windows available. Though there is a limit in the color variants of these windows, they can be painted to look beautiful. Follow the step-by-step instructions below to bring that perfect finish while painting your windows.

Step 1 - Spray Paint Fiberglass Windows at the Appropriate Temperature

Painting the fiberglass material has to be done at a specific temperature in order to get that perfect finish. The relative humidity must be less than 60%, and the temperature must be between 65 and 90 degrees Fahrenheit, otherwise water droplets may get trapped in the paint, and this can give a dull finish to the window. If water droplets get into the fiberglass, then it may result in the de-lamination of the glass.

Step 2 - Start Surface Preparation

Paint can stick evenly to the window only if the surface is not too greasy or sticky. Therefore, it is important to sand the surface of your window with the fine wet sandpaper so that there is enough roughness for perfect painting.

Step 3 - Apply Primer

First, primer has to be applied to the windows. This acts as a bond between the finishing paint and the surface of your fiberglass window. Primer can be applied heavily without following any strict guidelines.

Step 4 - Spray Paint

Wear a nose filter and gloves in order to protect yourself from inhaling the products as they may damage your lungs. Stir the paint with a stirrer and fill the paint in the HVLP spray gun and adjust the pressure in the compressor between 25 and 50 pounds; start the sprayer and paint your window by moving the spray gun uniformly to various parts of the window. Start painting from the middle of the window and slowly move to the outer edges. Remember to keep the spraying nozzle a little away from the window in order to allow uniform thin layers of paint to coat the window evenly. If the nozzle is very near to the window, thick layers are sprayed which may run or droop giving an uneven appearance.

Step 5 - Add Multiple Coatings

As the spray paint goes in thin layers, you may have to repeat the above step with multiple coating of paints in order to give a smooth finish to your windows. But after applying the first coat, allow the paint to dry. Then, light wet-sanding and cleaning are required before the application of a second coat in order to prevent the droopy spots, drips or runs.

Step 6 - Clean

Finally, excess paint that has been sprayed on the areas outside the windows has to be cleaned using a solvent and rag cloth.