Fiberglass doors have been popular for years now as a durable, energy-efficient alternative to wood doors that can be painted or stained.
Listen to ON FINISHING FIBERGLASS DOORS or read the text below:
Like any other surface, a stained fiberglass door can start to look dull and worn after a few years of heavy use and exposure to the weather. It's just as easy to revive a stained finish on fiberglass. Many pros recommend using a marine varnish for a glossy, durable shine that can withstand strong sunlight, water, and extremes of heat and cold.
First, clean and sand the door lightly with a fine sandpaper. If the stain has faded and you can see bare spots, apply another coat of stain. If the stain is still in good shape, go ahead and apply a few coats of varnish, using a narrow roller. Going over each coat after it dries with a fine steel wool can keep any bumps or bubbles from marring your new finish.
If your door is exposed to a lot of sunlight, look for varnish products that have ultraviolet resistance.
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For more finishes, consider:
How to Refinish a Wood Table
How to Choose a Paint Finish
Flawless Paint Finish