Knife-grade (high viscosity) stays put on vertical surfaces and in gaps - good for seaming and filling voids. Flow-grade (low viscosity) runs into tight cracks and hairline seams without air pockets - better for invisible crack repairs. Most shops stock both.

Pre-colored cartridges are the fastest option - already tinted to match common granite colors. For custom matches, use a clear base adhesive and mix in our coloring pastes. Test the cured color on a scrap piece first - epoxy often dries slightly darker than it looks wet.

Yes, but with caveats. Engineered quartz has a polymer-rich surface that doesn't bond as readily as natural stone. Some fabricators lightly abrade the bond surface first. Check the adhesive's spec sheet for compatibility - not all formulations work equally well on engineered stone.