I use a few choices. Model Masters clears, Tamiya clear X-22, Alclad clear gloss. Stay away from rattle cans, you may get a reaction you won't like. These 3 are all safe over Mr Color paint.
BK
On the bench:
Tamiya 1/35 M4A3E8 "Fury" with crew,
1/32 Kittyhawk Kingfisher,
1/35 Meng Panther Ausf A Early,
1/48 Pro Modeller P-51C "Boise Bee"
2022 Completed:
1/25 Revell 29 Highboy
1/48 Tamiya Sea Harrier
1/25 Revell 70 Boss 429 Mustang
1/48 Hasegawa D3A1 Type 99 Val