Step 4: Deep pour epoxy to create a tinted river of your choice
After ensuring your river basin is free of dust and particulate and that your seams are leak proof, it's time for the deep pour. Prepare Deep Pour epoxy along with any color tints using a 3:1 ratio, then mix by hand for three minutes.
Pour 1/4", watching carefully for leaks. After the pour, remove bubbles with a heat gun or torch. Deep pour twice more, 1/4" at a time, to a maximum depth of 3/4". If you pour more, the epoxy may overheat or even catch fire!
Dry for at least 24 hours and sand out any imperfections with 220 grit sandpaper, repeating this process until your river reaches your desired height.