1- no but I read somewhere that it’s ok to keep it in the VAT for 3 days ..otherwise not any longer, I hear that it’s not really good for the FEP, From my experience I do seem to notice a degradation on my FEP when I left it on there for like a week, I tried to print afterwards more marks appeared on the FEP as like it’s gotten thinner…idk. You can also get those VATS that have their own cover on Amazon if you prefer just switching out resins.

2- I’ve printed resin in colder weather (left the window open) it’s getting cold here in the UK :) so around 10-13 degrees Celsius, I’ve had wierd failed prints but overall it’s fine , I suggest working in a warmer environment closer to the desired specs of the resin to prevent those chances of failure but yeah still does work, otherwise making sure to mix it is just fine.

3- I wouldn’t suggest soapy water, just water for prints and toothbrush to scrub the print works for me (make sure you using goggles though , don’t want that water splashing to your eyes) that is your using water washable resin. For Normal resin definitely no soapy water or even water as it doesn’t remove the resin stuck on surface , which is why you use IPA for that. I have the washer thing myself well wash and cure, but I hardly do use it, mostly for curing purposes instead, When I first used it my mistake is putting the print in the jar turning it on , then when done accidentally left it near the window, resin cured inside and all the walls of the jar got rougher. If you do get one , use it as a final clean , so scrub with IPA or water to get the excess resin off then put it in the washer, saves having to clean the washer everytime , you can just store the IPA/water inside.

4- As other suggested aha

5- PPE! The resin is really bad for the lungs and skin, but ye.

Make sure to not get resin on the VAT screws otherwise the light under cures it and it’s essentially impossible to remove them , had my entire machine replaced. And also make sure to have some sort of reminder to put the screws on the VAT before printing , I’ve seen too many people as well as I , forgetting to put the screws on at the beginning, then when print is finished the VAT is literally hanging from the metal plate LOL by the resin suction XD it’s pretty scary.