any tips on getting this to flow into the floors air cavity? Mine fills the hole I drilled and does not move under the floor

Try tapping on tiles with rubber mallot to loosen any debris that may be stuck blocking the void under the tiles and or use a wire hanger or similar to poke through drilled holes to clear debris & vaccum out. Drill more holes in grout and try until you find the void and adhesive is accpeted and flowing under tiles... Worst case: If hollow spot is only in the middle of the tile you can use a diamond or glass drill bit and drill a hole right into middle of the tile over the most hollow souning spot and inject. Using the correct drill bit is most important or you can risk cracking the tile. This is last resort.

will this liquid become hard overtime?

The Fix-A-Floor adhesive dries with an elastomeric bond allowing for the natural expansion and contaraction of the sub floor. It will never crack and loose its bond.

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🔧 Fix it once, fix it right—floor perfection made easy!

DURABILITY THAT LASTS - Won't dry out, crack, or lose adhesion—ensuring your floors stay flawless over time.
EFFORTLESS DIY REPAIR - Simple drill-and-fill process designed for professionals and weekend warriors alike.
PROUDLY AMERICAN MADE - Crafted in the USA with premium quality and innovation you can trust.
UNMATCHED BONDING POWER - Locks tiles, marble, stone & wood firmly in place—no costly replacements needed.
VERSATILE COMPATIBILITY - Works seamlessly on all subfloor types, blending repairs invisibly with your floors.

Fix-A-FloorTile Repair Adhesive is a powerful, extra strength bonding solution designed for quick and durable repairs on tiles, marble, stone, and wood floors. Compatible with all subfloor materials and easy to apply with the included syringe applicator, it offers a professional-grade, DIY-friendly fix that won’t crack or lose adhesion. Proudly made in the USA, it’s the smart choice for lasting floor restoration.