Fibreglass boats
Practical Action
Resin putty
This material is used as filler, or for bedding deck fittings or filling internal corners on joints
which require bonding. Since it is composed
mostly of a filler powder, which is water absorbent, it should not be used on underwater
surfaces unless based on an epoxy resin.
Poly Vinyl Acetate (PVA)
PVA (a clear odourless liquid) is a releasing agent. A coating of PVA is used to prevent the
mould from sticking to the plug or finished hull.
Catalysts and accelerators
To cure (harden), resin requires a catalyst and an accelerator. Resin can be ordered with or
without the accelerator pre-mixed. Pre-accelerated resin is recommended because the
supplier is able to make a more thorough mix; and it is one less step for the user.
If accelerator is purchased separately, a purple liquid
(Cobalt Naphthanate) is usually used with Methyl Ethyl
Ketone Peroxide (MEKP) catalyst. When using un-
accelerated resin, the accelerator should be thoroughly
mixed in first. Accelerator and catalyst must never be
mixed directly together as this could cause an explosion.
Tools
The following tools are usually used for working
Fibreglass:
Paintbrushes of 1 inch and 2 inch width with
unpainted handles (handles can be waxed for
easier cleaning)
Mohair rollers in various sizes for applying resin
Washer-type laminating rollers
Credit Practical Action South Asia
Credit Practical Action South Asia
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