All is safe once cured thats it your away and done. They only time anything can leach is the gases it gives off but it would be well cured by the time water goes through.
Little tip…if your glueing up slide valves make sure they are open when clueing. any runs or drips can seal them shut and its a right pig to get them free. Also have all valves open so air can pass through your pipework, that way any gases are not trapped in the pipe work when it comes to fill time.