Fossiliferous limestone didn't come by it's name by accident -- it's unique calcium carbonate make-up contains not only crystals but a dazzling array of plant and animal fossils. Prehistoric critters, crystals and minerals however, create pockets of less dense material in fossiliferous limestone that may wear away and require repair.
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Things you need
- Stone epoxy
- 4-inch dry grinder, sanding pad
- Drywall knife
- Blue masking tape
- Stone patching kit
Clean the area in need of repair. For smaller areas in limestone, use an unsanded grout that matches the colour of the fossiliferous limestone. Mix grout to a stiff consistency, apply to the area and "cut" or smooth back the grout until its flush with the surface of the stone. Allow the grout time to dry for an hour, clean excess away with a wet sponge and lightly smooth out the grout patch. Do not use grout to repair corners of fossiliferous limestone.
Check with your local tile supplier and purchase a two-part epoxy or resin stone repair kit. For more stubborn repairs in damaged fossiliferous limestone this approach may be necessary. Use a porous stone patching kit for more porous limestone, more dense limestone does not require a porous patching material.
Surround the patch area with blue masking tape to avoid excess cleanup, clean the patch area. Mix part 'a' and part 'b' of the epoxy, follow the manufacturer's instructions. Add colouring to achieve a proper match to the fossiliferous limestone. Mix thoroughly and move fast -- remember; epoxies and resins dry quickly.
Apply the patch material, use a drywall knife or flat-edged tool. Smooth out the material, follow the contours of the stone and make sure that it is even with the surface. Add plastic shims to corners to keep the epoxy/resin in place. Avoid applying too much; this will create more work later.
Remove plastic shims and blue tape once the patch hardens. Grind and sand the patch flush with a 4-inch grinder, use a sanding disc that matches the surface finish of the limestone. Repeat steps 1 to 5 as necessary.
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