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Sanding a fiberglass door

Posted by the_dude (My Page) on
Mon, Apr 10, 06 at 1:49

The preveous owners painted over our fiberglass garage door to match the trim (forest green - we like the color). This door has some texturing to it. The issue is that the paint is in bad need of a new coat, but I think I'm going to have to sand certain portions that have chipped, and left pretty deep divits. My question is, how should I sand this door? I don't think I want to get too rough with it, but the chipped areas need to be feathered at least. The area that is chipped is pretty large, so doing this by hand would be a nightmare. Handheld orbital type might not be too bad.

Question 2:

The Jam(?) around the garage door has weakened and frayed at the bottom edges (water damage from snow?). It was recommended to sand, removed excess fraying(sp?), and fill in gaps with Bondo*(sp?) or some other fiberglass derivative. Does this sound like a pretty decent method to repair? I realize it's just patching it up, but I thought if I sealed it real well, then painted etc, it would hold up ok.

Your input is appreciated.

Frank (El Noobi-Homeowner)

Follow-Up Postings:

RE: Sanding a fiberglass door

The garage door jambs can be replaced with a wood composite material that will last a lifetime. It doesn't need painted if white is your color. It's paintable for other color choices. That's what I use when repairing outdoor structures like door jambs, window brickmolds, etc.

You can feather sand those chipped areas with #400 wet or dry sandpaper. Don't bear down hard, just lightly feather it out. The reason for the chips may be dirt under the paint.Be sure to scrub the door before proceeding. Since you're repainting them, I suggest a good water base bonding primer as your first coat. Glidden Gripper (ICI) or SW Bonding primer are both good choices. Finish with two quality top coats.


RE: Sanding a fiberglass door

Hello Michael

Thanks for the help. I'll look into replacing the door jamb, but to be honest I hadn't considered this. It seems like a huge undertaking. The jamb seems to disappear beyond the ceiling, so I'm not sure exactly how high it goes. But if I were to replace it, would replacing say the bottom half be an option? Or, when you change the jamb, doe the entire side have to be replaced?

I'll be sure the surface is clean before I paint. I didn't realize dirt could do that much damage to a paint job - I always thought it was some hail storms we had last year. The dirt makes sense though.

Thanks again.

RE: Sanding a fiberglass door

Yes, I've replaced half jambs many times. Just be sure the cut is square and flush fitted. You can use wood filler to fill the gap, sand smooth and it will disappear.


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