>>95916833
Pic related was my last attempt at something similar.
I tinted the resin with speed paint, and used tape to make the border. I was able to avoid leaks, but you can see that it came out a bit...wobbly. Not the worst thing, since it supposed to be seaside-ish. The surface also ended up a bit uneven; I actually ended up doing a second pour because the way it leveled out ended up leaving a 'bald' patch. Took a damn long time to cure, as well.