Once MM Metalizers are buffed out, I spray very light mists of future on it. I usually apply three coats and let it cure for at least a day. It will add to the sheen, so if you want something with a dull color it can't be used. I like it better than the MM sealer.
It can be masked over and paint will also stick to it. Decals also go on and stick very well without the yellowing or slivering.
Berny
Phormer Phantom Phixer 
On the bench
TF-102A Delta Dagger, 32nd FIS, 54-1370, 1/48 scale. Monogram Pro Modeler with C&H conversion.
Revell F-4E Phantom II 33rd TFW, 58th TFS, 69-260, 1/32 scale.
Tamiya F-4D Phantom II, 13th TFS, 66-8711, 1/32 scale. F-4 Phantom Group Build.