Sorry for the late in posting this. lots of job to do in the daytime, the sea presented here (well the master) was done during 2 evenings.
so here's the story.
there is no way i can reproduce a half transparent sea shore with another product than polyester resin
Then there is no way that i can produce some realistic waves just by sculpting them for the 10 minutes or so the resin will take to set
When the plaster is set, i then proceeded to sculpt the waves with Magic Sculp on the top of the plaster. then to reproduce '"accurately'" (well, we'll see the result eh..) the movement of the water;, i used some thick acrylic gel above it and shaped it with a brush.