3 ways to repair cracks, knots, and dents in wood [Amateur DIY woodworking hacks]

I tried repairing cracks, knots, and dents on wooden table tops and chairs using chigiri, instant adhesive, and putty. Please note that this is a work done by amateurs as a reference for DIY purposes, so please be aware of the work methods and quality.
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[@user-qv4zo7bs7b]

2選目、いいですね！

[@jinmiura6525]

とても参考になります。最後にスプレーのようなものを吹きかけていますがそれは何でしょうか?