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HOW TO RECOGNISE AND TREAT OSMOSIS .
THE MAIN SYMPTOM, 'BLISTERS' – Blisters are the
most common warning sign and if identified should be followed
up with immediate professional examination. Blisters can vary
from small pinhead blisters, to areas as large as the palm
of a hand. The presence of any fluid behind a blister indicates
a potential problem. If the fluid has a pungent, vinegary
odour or feels greasy or sticky when rubbed between the thumb
and forefinger, there is a high probability of osmosis. Before
any treatment is carried out, you need to establish what has
caused the problem. We recommend that you seek the advice
of a professional surveyor.
Some blisters occur for reasons other than osmosis. They are
often evident as a rash of small pinhead blisters or swellings,
either locally (often around the water-line) or over the entire
underwater area. These blisters are hard and difficult to
break and when broken open will be dry, with no odour evident.
The likely cause is air voids. This is not a serious problem,
but hull moisture levels should be checked before commencement
of any remedial treatment.
OTHER WARNING SIGNS TO LOOK FOR ARE: –
- STAR CRAZING – This effect can occur where
the gelcoat is brittle. Fine cracks usually form due to
severe flexing or impact damage, allowing water to seep
into the laminate.
- PINHOLES – Tiny bubbles present in the gelcoat
reduce its effectiveness and promote rapid water absorption.
- PROMINENT FIBRES – Seen protruding beneath
or through the gelcoat and can cause ‘wicking’
where water is drawn into the hull by capillary action.
- UNDERCURING OF THE GELCOAT – Incorrect mixing
or application in unsuitable conditions can cause failure
to cure properly. This results in porosity and may lead
to water ingress.
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