Lewmar hatch

Long Term Test (started 1992)




our comment

After correct installation absolutely water tight to today

The 1. - most important thing at a hatch surely is to be absolutely water tight even after many years . But to be water tight is standard today.

The acrylic glass points already after 4 years structure tears and becomes then nearly opaque. The acrylic glass quality used by Lewmar is miserable and far under the standard.

window 1
window 2
window 3

The 2. - most important thing at a hatch surely is that the acrylic glass is still transparent also after many years.

No spare parts for hatches, only new purchase of the entire hatch possible (different to e.g. Gojot)

The 3. - most important thing at a hatch surely is that one gets spare parts, e.g. acrylic glass, seal, handles and frames.


Hatches are screwed into the hull and additionally permanent elastic sealed


with silicone etc., which however does not stick, but shrinks itself and after approx. 1 year comes off. Leakage is the normal result.


with Sikkaflex etc., which sticks, does not shrink and does not come off.
Disadvantage: If one takes too much of Sikkaflex etc., the hatches are difficult to dismantle, if they are to be replaced.

our result: badly and not to recommend

  1. Our test - Lewmar hatches were correctly inserted (with Sikkaflex according to manufacturer's data) and since 1992 to today completely water tight. But completely water tight are all hatches from all other manufacturers we know. Completely water tight hatches are standard today.

  2. The acrylic glass with all 13 Lewmar test hatches (4 different hatch types) pointed already after 4 years structure tears and became practically opaque. That is neither because of the UV light nor because of the climate, but alone at bad acrylic glass. Other acrylic glass, built in by the shipyard directly beside the Lewmar hatches, is completely clear and transparent since 1992 until today without any structure tear. Also acrylic glass, which was procured by normal acrylic glass manufacturers and later built in for the test into 2 Lewmar hatches, are completely clear and transparent for many years now without any structure tear.

  3. The plastic handles at the hatches are without any damage since 1992 until today .

  4. The plastic frame fairing on the inside is originally white. It becomes yellow after 3 years, light brown after 6 years, brown after 9 years and breaks after 5 years. That is perhaps normal with plastic and much sun. But since Lewmar does not supply spare parts for its hatches, thus also no plastic frame, after 6 years each ship looks from the inside very unkempt. Other manufacturers e.g. Gojot supply for their hatches each spare part.

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