How much liquid dye do I need to make epoxy opaque?

Pigmently liquid dyes are translucent colorants. One bottle per mixed gallon gives a solid translucent tint; that is a general guideline, not a promise of opacity. Opaque color takes much more liquid dye, and on anything over a gallon it can take a significant amount. That is why one bottle of black in 96 oz of UltraClear Deep Pour Epoxy still reads see-through.

What matters is the volume of epoxy you are tinting, not the pour depth. For opaque color you have two options:

1. Use multiple bottles of liquid dye per gallon; test a small batch first to find the amount you need. 2. Switch to a Pigmently mica powder pigment. Powders reach a solid color without much added, so they are the easier choice for large pours. For a black you cannot see through, use Dark Matter powder pigment. For opaque white across 4 gallons, plan on two 51 g containers rather than one bottle of dye per gallon.

The 10 ml bottles are for small craft projects, not full pours; for a large pour get 2 to 3 of the 30 ml bottles, or a powder.

If a cured flood coat came out too light, scuff it with 220 to 320 grit sandpaper, wipe with denatured alcohol or acetone, and pour a new tinted flood coat over it. Pigment does not let you skip the seal coat over wood; unsealed wood still releases bubbles into the pour. Add color to the hardener first and test small.