You're using used pistons ?

I hope those are going in the same engine they came out of with the same original untouched bore.
The molly coating on the skirts is a good thing ,for less wear .
The ceramic coating on the top is usaully only done on big turbo builds or very high compression builds.Not so much effective on a regular N/A build.
The carbon build up the engine produces makes a coating on the pistons ,and that is very benificial.
PS: I'm from Belgium ,and i'm also on Hondaperformance ,Hondaclubbelgium,and civicclubholland.