People around here use Plastikote
https://www.amazon.co.uk/d/Painting-...rds=plastikote
But if you're not from the UK maybe it will be hard to get. If so, I would recommend you to get a water based varnish (because that is what plastikote is) and it would be ideal if the water based varnish has a "pet safe" label (wich platikote doesn't have, but it's safe anyway)