Applying a Patch for Stress Reinforcement

This is a video of me repairing a Souris River Quetico 17 that is owned by all of us while residing in the US Forest Service.  This canoe had a million miles on it and showed signs of working ridiculously hard during the Pagami Forest Fire of 2011.  It was oil-canning and had some major, over-flexed stress marks/cracks that while they were still not leaking, would eventually need attention.  On this canoe, I ended up levering the bottom out to close to it’s original shape and then applying reinforcements to the chines (where the side meets the bottom).  The damage to this canoe would indicate to me that it was dragged over a fair number of beaver dams or other obstacles.  Very reparable and I will be releasing more vids of this repair/restore in the future.

Remember the principle is always the same with applying patches.  Clean, sand, wipe the dust, apply resin, stick on patch, apply more resin, smooth out the bubbles, check and re-check.

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Canoe Patch – The Principles are Always the Same

Repairing a crack in a Souris River Canoe
by Red Rock Wilderness Store

Note:  This is an older post from years ago.  You will see me vary my technique here and there throughout this website.  Don’t get all excited.  The principle always remains the same.  If you don’t have a squeegee or a little roller doohickey, it doesn’t matter.  Use something else to arrive at the following list of procedures.  The tools do not make the result.  The principle does.  I have esxplain this because people go into a tizzy if they can find a squeegee.  You could also use a soft sponge over the top of the plastic wrap to aid in pushing out the air bubbles from the resin.  Be inventive.  Be MacGuyver.  The basic principles to applying a patch to anything (talking about kevlar canoes here) are as follows:

  1. Sand
  2. Stick on patch
  3. Wet out with resin
  4. Cover with plastic (outside of  canoe only) 
  5. Squeeze out air bubbles
  6. Let cure
  7. Peel off plastic
  8. Paddle

Installing Skid Plates on your canoe?  Click Here

This CAN happen!  This Souris River Wilderness 18 in kevlar was whapped into something so hard (flew off a canoe rack when some clueless individual didn’t bother tying this 46 lb. canoe down) there was a big dent in one gunwale and a 14″ stress mark in the side. The crack you see below did not leak a drop and the canoe actually went out on a 7 day canoe trip in the stressed condition which is way more than you can expect to see in other non-flexing, foam-core kevlars made with vinylester resin. The majority of name-brand, non-epoxy-resin canoes would have been unusable-until-repaired with this damage.  Nonetheless, this Souris River did need to be repaired to prevent further fiber breakdown in the future so here’s how I did it using West System Epoxy resin that we sell here at Red Rock.  This is how you would repair most cloth-layup canoes with cracks or punctures as well, only you would need to apply the same patch on the inside (minus the plastic wrap).

1. Sand area of crack with 80 grit sand paper.

1sandarea (1)

2. Cut a piece of kevlar to cover the cracked region.

3. Further refine your cut if desired to fit repair area.

4. Mix up some epoxy resin and apply with disposable brush evenly over entire patch area.

5. Stick on pre-cut patch. Make sure you center it over the damage.

6. Apply manageable amount of resin to patch.

7. Use a squeegee to wet the cloth completely with resin.

Be careful at the edges of the kevlar cloth because it likes to fray

8. Cover patch with plastic wrap and stretch it tight with tape.

9. Roll out all the air bubbles by forcing them to the edge of the plastic with a little wallpaper roller. Let it sit to cure.

After 5+ hours, peel off the plastic. Wait’ll tomorrow before putting it on the water. This patch turned out well with smooth “ramps” of resin along the edge of the patch, minimizing resistance in the water, or more importantly, obstacles such as rocks, etc.