Fixing bad fiberglass job

My buddy and are are totally new at this.  We made a couple of mistakes in our first attempt at fiberglassing the sides of our stitch and glue driftboat.  The result is that a couple of places didn't get soaked through before the epoxy set, so there are white patches that clearly aren't bonded.  Can I sand these down, put new glass patches on and re-do those spots?  I'll know better next time.

 

Thanks in advance.  This is a great site and I'm learning a lot.  I'm sure we'll make more mistakes, but less than if we didn't have this resource.

 

Ed

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Permalink Reply by lhedrick on February 21, 2011 at 4:29pm

Ed, 

 

When wetting out glass cloth you need to work quickly and use slow hardner and not mix too much.  As the epoxy start to cross link and form long chains it doesn't want to soak into the glass.

 

If you can pull it up with the point of a utility knife then I would cut out the unboned section and peel it off.  Mix up some thickened epoxy and feather the edge of the remaining glass.   Then glass on a new piece of glass which overlaps the edge by 2 inches.  

 

Don't try to sand it.  In the first few days the epoxy will often still be soft and gum up the sandpaper.

 

After the patch and full cure it will all sand down and look fine.

 

 

Permalink Reply by Ed Morrison on February 21, 2011 at 9:23pm
Thanks, that's very helpful, and I can do that.

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