I recently took the intake manifold off my 2009 Honda Fit.
The mating surfaces of the lower intake manifold, gasket, and cylinder head were uneven, so I cleaned them via acetone and hand sanded with 220 grit sandpaper.
Now I understand that the sandpaper on the aluminum probably wasn't a good idea, and I'm a little concerned about the seal. I'm replacing the gasket with a new one. Should I also apply a liquid sealant? If so, what kind?
I'm pretty sure the manifold and cylinder head are aluminum (please check me), and the gasket MLS.
Note that the below images are from the net, mine was much more corroded.