Evap Lines

LJ • 1 baby girl with another baby on the way
So, I have a lot of questions about evaporation lines and I'm just wondering what everyone's experiences are.
I have a few questions so I'll post them here and if you guys have any answers please comment below or if you just want to share your story or experience then that's good too. :) 
​So...
​1. Will an evap line eventually fade? 
​2. Will all tests have an evap line after a certain amount of time?
​3. If I hold my tests up to the light I can see the test line clearly..would I see this anyway even if it was meh or poss even before peeing it? (craZy I know, but I can't be the only one)
​so those are my main questions I can think of right now and I hope someone can give me some answers?!?
​Finally..I'm just wondering..I have a 28 day cycle and I'm day 29 now..I'm getting faint lines (poss Evaps hence questions) I've had four faint positives now and I'm just wondering if I have maybe ovulated later and that's why lines are still so faint? I don't temp or do opks. But I would assume if I ovulated day 14 the line would be much darker especially since one test was an early predictor. 
​Thanks guys sorry for the huge post!!