I am a firm believer in slating also.
You just have to have something to KNOW for certain which take belongs with the audio of THAT take.
And with Super 8, you only have 2.5 minutes per roll, so you sometimes end up running out of film in the middle of a take, picking up on the next roll, etc., with little disjointed bits of the scene on ten rolls or whatever.
They come back from the lab in no particular order, you put them on your viewer to figure out which ones are which, and guess what?
They all look the same to you. You have no idea which was the first take, the third, etc.
(Although I did learn to number my rolls right on the part of the PK-59 mailer that they send back to you with your address on it, so you can order your rolls).

Anyway, yeah use the dry erase ones, and gaffer tape an 18% grey card to the back, and when you start a new roll, shoot a few seconds of grey, flip it over, & slate.
Also, SHOOT YOUR SLATE REALLY CLOSE UP. Mark your lens focal length on your camera with a bit of gaffers tape, zoom all the way into the slate, mark it, then zoom out to your marked focal length.
I don't know how many times I simply could not read the slate, because it was either too far away, underlit, or both. S8 is so tiny, that whatever is not pretty close in, is not going to be sharp enough to read small detail. A slate is the prime example of this, especially the chalk ones.
man, I wish someone would make a cheap SMPTE slate...

Matt Pacini