This Instructable comes from a recent project I have been working on that involves fixing up an old fiberglass travel trailer. In the remodeling of this trailer, I was left with many small holes from antiquated peripherals on the sides of the trailer (like a phone jack). There was also a six inch crack in the front from a rock hitting it on the road.

I actively searched for the best way to patch small holes in fiberglass on the web, and couldn't quite find concise answers - this lead to a more dedicated search. I ended up talking to surfers, sailors, and prop-masters about how they make repairs to structual fiberglass and came up with the following methodology.

Hope this is helpful, and I would love to hear back from the community on this.

Step 1: Materials and Tools

DISCLAIMER: Working with Fiberglass is rough. It is nasty nasty stuff, and can get into your skin, your lungs, and your eyes. When working with these materials it is important to wear a respirator, gloves, and safety glasses. It is advised that you wear a paint suit to cover all skin that could be exposed to fiberglass particulate.

I got a bulk of my materials from Douglas and Sturgess in Richmond, CA - the folks at the store were incredibly helpful and super nice! THANK YOU!

Materials: Tools:
  • Small Disposable Paintbrush
  • Angle Grinder with Grinding Disc
  • Orbital Sander with 80 Grit Disc
Odds and Ends:
  • Stir Sticks
  • Respirator
  • Gloves
  • Safety Glasses
  • Permanent Marker
  • Duct Tape
  • Rags
Am a fiberglass moulder (lamination) I want a job in London
<p>Thanks for the great information!</p>
<p>I'll have to give this a shot at work. We' have some minor cracks and dents in the glass that could use some fixing up. If the problems keep up, we'll have to get a professional eventually. Otherwise, this doesn't sound like that bad of an idea to get fixed. I'll pass it to my superior and hopefully he'll approve this project.</p><p> http://www.ejfiberglass.com/Services/ </p>
<p>Thanks for the clear instructions, I repaired a large pot in a fountain after reading this.</p>
Edit: &quot;BONDO&quot;<br><br>(darned autocorrect)
Why didn't you use Bonding as the filler?
i have always wondered how to do this
Good! <br>Went to my Blog, and see there, also, 2 Posts down, about Sandables: <br>http://faz-voce-mesmo.blogspot.pt/2013/01/reparar-fibra-de-vidro-rasperry-pi-e.html
Very useful info, Audrey, thanks for sharing it.

About This Instructable


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Bio: i work at instructables! i make things with technology, eat pho, and play electric ukulele.
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