Should a GRP vessel have moisture readings taken immediately after removal from the water?
Osmosis and moisture are on the mind of most GRP vessel purchasers. Without getting too technical, most hulls will have a moisture content when first removed from the water. This can very quickly evaporate over a matter of minutes or sometimes up to three weeks (or longer). We are interested in retained moisture and hydroscopic chemicals within the laminate. If the readings are low when the vessel has just been lifted out, then we can all breath a sigh of relief. If moisture is detected, it can be difficult to determine whether this is temporary or retained due to an osmotic process. The vessel’s gel coat will be very closely examined to determine whether any osmotic process damage has taken place, this can be determined under all circumstances. So, ideally we would check boats after a period ashore but this is often not possible. We will make our best judgement based on the readings we obtain and our physical inspection, and advise accordingly.
Related Questions
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