It should be in some flat white paints.
Look up brands that have it in it already and yes you can pain directly in plywood.
If you don't wanna do plywood buy pasteboard
A one part system fuck the multi part ones.
I tend to stick to dynagro foliage pro.
Some like jacks 20-20-20 is good as well.
Try adding some ferts that are in sulfate form as well that'll help with trich production
Finger test doesn't mean jack shit.
Stick with your soil moisture meter or lift the pot.
Reason finger test doesn't work is because 2inches dry in a one gallon pot wouldn't be the same as top 2 inches dry in a 5 or 10 gallon pot
You've made a bunch of threads all with the same stuff posted.
Either ditch the tent and grow in an open area or like others have told you, go with a bigger tent
Also some hygrometers/thermometers are + or- 5 degrees or so.
If it makes you feel better then that's fine keep doing what you're doing.
I'm just trying to help people have an understanding instead of blindly following forum paradigms that get regurgitated on here.
But seriously click on that link
You starve your plants by stopping ferts at week 5? For goodness sakes that's a pivotal point in your plants life and does more harm than good.
Read the link I posted earlier in the thread