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R-17 Halny - Fibre Glass Laminating HOW-TO |
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Written by Andrzej Antosiewicz
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Sunday, 22 April 2007 |
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Page 2 of 3
Laminating the lighthouse
Again first layer is gelcoat. This time as dye I used white colour so it is easier to paint on black surface. We paint with thin coat. Used only around 15g. If the form has some sharp edges we are trying to ‘neutralize’ them with gelcoat. Such painted mould has to wait now till resin starts to settle.
We start to apply fibre glass cloth, thin at first and it does not have to be one piece. What is important that the pieces should overlap for around 1 cm as seen on the picture.
We soak it thoroughly with resin. No air bubbles under the cloth! If we soak a bit too much outside of the mould, it is better to wipe the excess now, later the cloth will not be splitting. Subsequent layers are of thicker cloth. Number of layers depend on the thickness you want to achieve on your deckhouse / structure. For example 2 layers of 120 g / m2 and 2 of 240 g/m2 give laminate of around 0.7 mm. We are trying to give as much resin as needed only to soak the cloth. It should not swim in resin.
In the future perhaps I will need to glue in some internal frames or the walls will be to thin and to have good base for gluing a piece of de-laminating cloth could be used. This cloth has 2 objectives. It absorbs excess of resin and prepares the surface for future treatment.
For de-laminating cloth we can use lining material used by tailors, but it should be artificial not cotton like but made of polyester. We put the cloth on last coat of resin and without any extra resin any more. The cloth will not easy stick despite the fact that resin will soak through the fibres. Lining does not fit so well as fibre glass cloth. You can assume it does not fit at all. Toa achieve the goal it is better to cut into small pieces.
We leave laminate for 48 hours. We tear off de-laminating cloth and we have nice rough surface on the inside. And we take out laminate out of the mould. It is good to place it back in the form to season a bit.
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Last Updated ( Thursday, 28 June 2007 )
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