Flush mounting in deck?

[Nasher]

I'm moving along with my project to add flush anchor points in the deck of my RIB.

I'll be using a router to create a recess in the deck so that when flat plates are dropped in their top surface is flush with the deck surface.

I'm going to make the recess 2mm bigger all round than the plates, so that I can bed the plates in sealant such as Sikaflex and have a 2mm bead all the way round. The idea being to create a seal to stop water finding it's way into the ply. I'll also be painting the inside of the recesses with epoxy.

Question for the boat builders.
Is 2mm wide enough? Or should I be thinking of a wider gap to give some thickness to the sealant?
I'd appreciate your thoughts

Thanks

Nasher

[spartacus]

Ignore... didn't realise the original thread was one-up. See what happens after 3 glasses of Pinot Grigio!