Hello me, er you
. I have recently made a mould of a keel. First I made a wooden keel the same size and shape. Then I made sure it was sanded smooth. With your hull is it a smooth cross section, IE are there any ridges sticking out? If not then the next step is to make a box just big enough for the hull to fit in with about 3cm space all round. If there is a big space between the hull and the corners of the box then fill them with wood (screw them in!)
Next cover the hull with a few layers of good quality car wax and allow it to dry with each layer.
Next 80% fill the box with plaster. The corners filled with wood are cheaper than plaster!
Now push your hull into the plaster and hold it there with two batons screwed into the box sides. These stop the hull rising.
Once the plaster has set you should be able to ease out the unscathed hull.
Now the next bit I would clean the mould and then check for damage. If all is ok give it a few good coats of release agent (car wax or real release agent) then use your material of choice soaked in resine. It should give a smooth finish. It may need a little filler here and there but hey........ See 'Alantis' in yachts and sail for my plaster mould box........ Good luck. U2
