I bought a used 650c road bike for my oldest kid which has a carbon seat post and full carbon fork. The bike is now been passed down to our youngest and it is 11 years old at this point, so it is older than the kid that is using it now.

I haven't thought twice about the fork since the day I pulled it and looked it over. It was solid looking and feeling then and has been the same each time I have checked it while cleaning or working on the bike.

Paint can hide issues in any material.