D-D aquascape epoxy gray (113 g) is a versatile two-part epoxy putty tailored for aquarium use in both freshwater and marine setups. Here's a full breakdown:

• A two-component underwater epoxy, composed of equal parts resin and hardener, mixed by hand until uniform .

• The slate grey option is especially suited to freshwater rockscapes, pond liners, or decorative aquascapes—it matches natural stone tones

Curing and Handling

• Initial set: semi‑hard in ~3–4 hours at 20–25 °C (may take longer underwater)

• Fully cured: rock‑hard overnight; supports drilling, sawing, sanding, painting, and is heat resistant up to 130 °C

• Faster cure: microwaving mixed putty for ~10 seconds can speed things up

Ideal Uses

• Building stable rock structures—bonding base rocks, creating feet to avoid anoxic zones

• Fragging corals, mounting them to plugs or rock slabs

• Clam bases to deter bristle worm predation

• Fixing leaks, bonding pipes or equipment parts, and attaching ornaments to glass

• Overworld repairs: stone grey hides well in ponds or freshwater setups .

Safety & Best Practices

• Very sticky on wet surfaces—bonds to damp rocks, pipes, glass

• Avoid over‑manipulation underwater: talc in the mix can cloud water; stop work if cloudiness occurs and allow to settle

• Only 6 out of ~30,000 units reported causing issues—usually due to improper use (anoxic zones or excessive talc)

• Reddit users caution: uncured epoxy or dust can be harmful—only add fully cured material, and rinse before submersion

Summary

Aquascape epoxy gray is a robust, reef-safe bonding solution that’s ideal for constructing and stabilizing aquascapes, fragging corals, protecting clams, repairing equipment, and more. Its slate-grey color blends naturally in rock environments. Just handle carefully—don’t overwork underwater, wait for it to cure, and rinse off any residue before use to ensure the best results.