Epoxy disaster!

Submitted bypifferl onThu, 06/11/2020 - 09:01

Boy I messed this up!  I was putting on the epoxy, using a MAS 2:1 epoxy.  After I was finished and I was marveling at the job, I noticed that there were a few spots that were missed.  I had very little epoxy left so when I poured it out there was not enough to align with a mark on the graduated plastic cups I was using, so I eyeballed the ratio.  Bottom line, the ratio was bad and now wherever I put this last bit of expoxy is soft 4 days later.  Areas where I did not hit with this mis-ratio’d batch is OK.

The question is, how do I take off the bad epoxy?  I tried denatured alcohol and mineral spirits but the epoxy just grabs onto the applicator.  I am able to mechanically remove it using a razor blade so maybe something like that might work, it’s just after covering the missed spots I did some additional spreading so about 40% of the boat is at issue and a mechanical removal would be tedious.  Mechanical removal revealed solid epoxy underneath.

is there a chemical I could use that would remove the bad and keep the good?

thanks for any help that can be provided.











Thu, 06/11/2020 - 13:11

And a wire brush....

It will be tedious, but an hour or so should do it.

If the vinegar doesn't do the trick, go up the scale for more active solvents - lacquer thinner, acetone...

The first thing I would try would be to put the boat out on a hot sunny day, to see if the epoxy will harden.

Don't put the boat out in the ht sun unless it is sealed on both sides, if it is sealed on both sides I would try that first.

I did the same thing recently...terrible ratio. I used a plastic scraper to remove the worst of the mess then wiped with shop towels soaked in acetone. It cleaned up perfectly. I recomment syringes for small jobs to avoid future messes.

Robert N Pruden

I have used a plastic scraper.  Acetone will be next.  They say you screw up an epoxy ratio once, then never again!  I can see why!


With me taking off the gummy epoxy over the weekend, I decided to try to repair a gouge.  I used a heat gun and softened the epoxy, cut the fiberglass and exposed the wood.  So, I have a small gouge about 1/4” deep x 3/8” wide x 1” long within one strip.  I am familiar with the idea of using cedar sandings plus epoxy, but I was concerned it might be too dark.  Could a appropriately colored wood filler work?



Allan Newhouse

Mon, 06/15/2020 - 06:53

Sanding dust mixed with epoxy doesn't give you a filler the same colour as the timber because it is effectively end grain and comes out darker.

Most timber, even if protected from UV light, will change colour over time, so if you get a wood putty that is a perfect match now, it won't be in a few year's time.

Your best option, as John said, is a sliver of wood.


Tue, 06/16/2020 - 00:24

I will get my exacto knife and get ready to operate!

Sometimes it's easier and produces a cleaner  result on a larger 'hole' if you can remove a straight-sided section, with 'ramps' at the ends.  Sort of a 'double scarf' patch.

So, sharp tools and courage!  :)

Get out your collection of wood strip scraps to get a color/grain match!