There are quite a few ways to make water. Here are a couple.
1. Fiberglass resin: Use fiberglass resin for fiberglass repair. It comes in a two part compound where you add the hardener to the liquid resin. It can be found in the auto repair section at Wal-Mart or the like. You can only pour thin layers, about 1/8 - 1/4 inch at a time. Be carefull, it does heat up and will dissolve some paints. It also shrinks slightly when cured. You can tint the water by adding in paint to the resin before you pour it as well. Also, by varying the color of the layers, you can add the look of depth. This is the method I prefer. Here is an example.
To represent the wake, I use 5-minute epoxy built up behind the boat in a wake. Either leave it untinted or add some white to it for the foam and froth.
2. Tinted glass. Another option is to use tinted glass. This allows something under the waterline to be seen. It is best for flat, smooth water. The glass can be tinted with stained glass paint. It is transparent and is used to paint on glass or plastic to represent stained glass. You can aslo get glass that has some texture to represent small waves. Here is an example of this method.
3. Plaster or Celluclay (Paper Mache). You can aslo form the water in plaster or paper mache and paint it as water. To give it the illusion of depth, coat with many thick layers of gloss lacquer or shilac once done. Sorry, no examples. Many ship builders use this method to represent the sea in large areas for ship dios.
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