I did this after consulting with Lewmar
, the guys who made the hatches. They specified a silicone rubber sealant
with a specific number which I cannot remember!However I can say that the reference number of the sealant
was the same as the most common type of builder's silicone rubber sealant in my local store!Maybe your hatches are by another manufacturer, so it may be possible to visit their website to settle the matter?
Good sailing to all!