ZERO Paint ZP-3006 2 Pack Clear Coat 100ml Urethan (Zero):

Mixing Ratio : 100 Parts Clear, 50 Parts Hardener + 10-30% Thinners
(e.g. 50ml Clear, 25ml Clear + 15ml Thinners).
Drying Times : Air Drying  at 20^oC, Dust Free 30 Mins, Tack Free : 10-12 Hours, Thoroughly Dry : 48 Hours. Can be polished after 12 hours at 20^oC

* So far we have found that the clear coat is safe over all major brands of Decals
Tamiya, Fujimi, Aoshima, Studio 27, Cartograf, Scale Motorsport etc.