I hope I do not make a fool of myself with this hand :-/
You said: "Limpers are free money" and I almost heard you say: "Why are we in the Big Blind with 42o in an unraised pot"?
So I thought this would be a good steal situation. I did a standard C-bet which got called. This is again a hand in which I have the feeling i get "floated", you see he gets aggressive on the turn, of course I did fold.
Maybe you can tell me a little bit which flops are good to C-bet against limpers and which ones are not.
I don't know if you know the legendary video of Daut from Cardrunners because you said you are not member, there he talks about it and says these kind of flops are bad against limpers, because they often limp medium Pocket Pairs or medium Suited Connectors which are hit by these flops. However, he is playing 3/6 FR in that video, so I am not sure if this applies for my stakes.

Ya Daut is right. but thats a bad flop to bet because when you are betting this flop you are more thinking of you opponents calling range and on these flops specially at your limit. Any pair/any 8/any J/and even any6/ and sometimes shits like KQ keep calling you. That being said its also not a bad idea to bet this flop because ur hand has ZERO potential of getting any better so basically ur only chance of winning this pot is by betting it out and where is a better street to steal than flop?
Checking here would be a better play with a 6 or a J or even hands like 57. But that being said. Try to steal the limpers money with hands that has a little more potential so just fold all the non suited hands from BB. like here I prefer a K4s to a 24o but I prefer 24s to both of them. But if you are not perfectly comfortable with this play just don't use it. Keep it in you dictionary and let it stay there so later you might wanna try it out. Try to develop your own style from the things you know/heard/learned from others.