Thank you @jnart. I think I will continue making short videos when I work. Looks there are lot of things I consider ''normal'' and other people are not familiar with.
As consider brushes those large one are great for watering paper and many other staff, you can buy them here https://www.aliexpress.com/item/fine-goat-hair-hake-brush-2560-series/1931613058.html?spm=2114.search0104.3.307.6e07761bsp3E6Q&ws_ab_test=searchweb0_0,searchweb201602_5_10152_10151_10065_10344_10068_5722815_10342_10343_10340_5722915_10341_5722615_10697_10696_10084_10083_10618_10307_5722715_10059_10534_100031_10103_441_10624_10623_10622_5722515_10621_10620,searchweb201603_19,ppcSwitch_4&algo_expid=245178f2-bc41-4f97-a0b0-4f8051098dba-43&algo_pvid=245178f2-bc41-4f97-a0b0-4f8051098dba&transAbTest=ae803_2&priceBeautifyAB=0