I've been looking for a design for a small boat that will fit in the back of my 4WD when I go travelling. Inside the vehicle so I don't have to drag a trailer everywhere. Stable enough so I don't get tipped in too often.

A friend pointed me towards a boat called the "Water Rat". The original design and prototype were by Doug Laver. The plans were drawn by Ross Lillistone and are available from Duckworks Boatbuilders Supply.

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Friday 9 January 2015

Fibreglass on Bottom Panels

With the decks in place there was no longer any excuse for not starting the fibreglass covering on the outside of the boat. After a final sanding and a thorough vacuuming and a wipe over with a cloth dampened with acetone and several deep breaths I began.

I mixed batches of epoxy as I went along using Boat Cote resin and the "tropical" hardener to gain a longer working time. The epoxy was poured into a paint tray and rolled onto the boat with a 75 mm roller. Draping the cloth over the boat was difficult because it sticks as soon as it touches and pulling it up to rearrange it tend to stretch it out of shape. However, I managed to get it on. I rolled it with a serrated roller to get the air bubbles out and rolled more epoxy on to make sure the glass cloth was saturated. It's a tricky process needing just enough epoxy to saturate the cloth because any excess will tend to run or sag.


That's what it looked like after I had finished. Pretty good I thought as I closed the shed and left it to dry out but while the epoxy is wet and shiny it is hard to see the runs!

Even on this small boat I learned several things about laying fibreglass cloth. Not in any sort of order:
You need good scissors to cut the cloth cleanly.
It would be a good idea to cut the cloth to shape before starting with the epoxy.
You need scalpels or razor blades to cut the cloth in places where it refuses to lie flat, eg on curving corners. The cloth stretches within limits but I needed to make cuts so it could overlap in a few places.
Cutting the wet cloth with scissors is the end of the scissors, I could not clean them. Fortunately I discovered this on cheap scissors!
You need at least one helper because you are working against the clock. A helper can keep up the supply of epoxy to avoid pauses on the application. A helper can help with the rolling on of the epoxy, a priming coat which will soak in pretty quickly and a second coat so the surface is wet. Two people can more easily position the cloth, roll it out and roll on more epoxy to fill the cloth.
The foam rollers can't be cleaned - I put one in acetone to reuse on the next stage but the acetone destroyed to plastic tube.

5 comments:

  1. Hi there,
    I have just purchased the plans for this and will be starting work on it in the next wee while. Have enjoyed looking through this blog, thanks!
    Wee query - I see here you have fibreglassed the bottom panels, what about the top panels?
    Cheers!

    ReplyDelete
    Replies
    1. I didn't glass the top because I wanted to keep the weight down. It is the bottom that gets knocked about and really does need the protection.
      Enjoy building your boat and then using her.
      Dave.

      Delete
    2. Thanks for your reply!
      So the top decks get a good coating of epoxy and paint only?
      Thanks for your help - newbie boat builder here!
      Scott.

      Delete
  2. Hi Dave,
    You would know me as one of the many Ian's, Ron's mate, from WBAQ.
    Interested in building a Water Rat (for mess-abouts)and curious to know what size you built. Assuming you went for 9 foot is that as easy to paddle as the longer 10foot plus version? Are you still happy with its performance?

    Thanks for the blog - good info.
    Cheers
    Ian Godbold

    ReplyDelete
  3. Hi Dave,
    You would know me as one of the many Ian's, Ron's mate, from WBAQ.
    Interested in building a Water Rat (for mess-abouts)and curious to know what size you built. Assuming you went for 9 foot is that as easy to paddle as the longer 10foot plus version? Are you still happy with its performance?

    Thanks for the blog - good info.
    Cheers
    Ian Godbold

    ReplyDelete