Hey, I'm from US and can't understand Chinese really at all. But I notice in this video you're using something similar to what we have in USA we call joint compound for patching/skim coating, but then in another video you use this weird homemade mixture with oil and solvent and put wallpaper over it after? What's the reasoning behind that oil based mixture with lime powder? We definitely don't have/use any kind of oil based skim coating type things in USA. Also in Taiwan recently I got some trowels like you use and I really really like them compared to US style taping knives. I hope you can answer and thanks very much! :)