My worktop
(made by Bushboard) has been fitted by professional kitchen fitters. I believe the cut surfaces have not been sealed; the manufacturer's fitting instructions are absolutely explicit
- "all edges must be sealed... either with laminate... or a coat of silicon adhesive or .. 2 coats of polyurethene varnish"
It has been extensively cut on sides, back edge and for hob/sink . It has a right angle joint also, don't know if that has ...

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