Just joined the tables, no reads.

I get [9c] in the BB, There are a few limpers, and 4 see a flop of [8c][4c].
SB leads for $3, I raise the pot, MP comes over the top for $40, SB pushes allin, I?? Both have full stacks.

Shove all in.

I am fine losing a stack here only because flopped flush over flush to me is like set over a set

it happens, move on

Yes, do that - you know this too.

If you had a smaller flush, like 7[c]X[c] than yes, I'd fold.

As played, call and prepare to be stacked by A[c]X[c] - at those stacks with no read you just can't get off the hand as their range is far wider than the flopped nuts.

Furthermore, I think it's unlikely either of them has the nut flush since they are so inclined to raise on a board like that in an unraised pot.

SB has 4-4 and MP probably has A[c]8

I always think laying down a flopped flush is a difficult thing to do, but sometimes the situation dictates it.

In this situation, it looks like the worst you could be up against are an A[c]/4-4/8-8/made flush.

I have been overflushed many times, and the way to get off of it is to identify the range of your opponents.

Regardless of what you have, the SB is repping a flopped flush or a set (maybe Q-8 if he's an uber-donk) and MP is repping at worst a semi-bluff A[c] (he could also have 4-4 or a flopped flush like 7[c]6[c].

Not saying you always gotta fold it, but I think this particular situation would dictate that you should fold a small flopped flush with no reads if you've got two people committing themselves all-in (you don't think the guy who raised to $40 is going away, do you?)

You've got $8 committed, do you want to be in a three-way all-in hoping you are up against 4-4 and the A[c]?

I'm all-in. They can both have lower flushes, sets, even 2 pair. No fricking way I lay down the second nuts on the flop, ever.

IMO you lose a stack here 1 time in 5, and you win 2 stacks (if you can dodge the board pairing) the other 4 times. If one has top 2 and the other has bottom set they are drawing very very slim.