Cut V along the crack.

Completely remove dust with a Wire Brush, electric blower, etc., and apply a resin primer. (The photo uses Alpron W-305)

Fill the resin mortar (the photo uses Alpron HM) so that air does not enter.
* The point is to serve it about 1 mm higher than the surroundings.

After about 2 hours, confirm that it is completely hardening.
Once hardening, use a # 36 grindstone to polishing it so that it is flat with the surrounding area.

After cleaning, apply a primer and apply a repair material.
It is an image that fills small dents.

When the repair material is half-dried, scrape off excess repair material with a scraper .
Rub it with # 600 paper so that there are no leftovers.

Trowel-coating the lining material over the Primer.
It is evenly flattening by applying a lining material .
When the lining material is completely dry, use scraper # 600 paper to blend in any excess trowel marks or borders with the surrounding area.
That's all for the groundwork.

Let's add color.
At first, spray a little and check the color. Let's add it little by little while drying.
There is no discomfort with the surroundings, and it is OK when the groundwork disappears.

Add a pattern.
First, apply # 600 sandpaper to the surface.
stain and pattern to eliminate discomfort with the surroundings.
If there is no discomfort, it is complete.