plastic combed scraper

A combed plastic scraper is one of the tools used for priming

Using these scrapers, you stick a small amount of epoxy and hardener on the desired surface.

Finally, you need to consider the way to hold the spatula. If the spatula is taken vertically, then you should hold the spatula vertically till the work is done

If you take the spatula in an oblique way, take the spatula in the same way until the end.