Common practice on most brands is to use one clear glaze coat in the trapway to seal it.
Everything has looked the same to me for years and with good results.
As an example, the Toto Drake will consistently move 900 grams of waste and the Ultramax 700 grams.
Most others move considerably less.
Kohler Wellworth elongated moves something like 125 grams.
I use the Toto both for homes with small children and for commercial use.