ZERO Paint ZP-3012 FLAT 2 Pack Clearcoat 100ml (Urethane) (Zero):

100ml Matt Clear Coat (Medium Solid)  also known as Urethane or Polyurethane (Supplied in Glass Bottle)
25ml Hardener  (Supplied in Glass Bottle)
60ml Thinners (Supplied in Glass Bottle)

Mixing Ratio : 100 Parts Clear + 25 Parts Hardener + 30 Parts Thinner.
(e.g. 50ml Clear, 12.5ml Clear + 15ml Thinners)

Drying Times : Air Drying  at 20oC, Dust Free 30 Mins, Tack Free : 10-12 Hours, Thoroughly Dry : 24 Hours.

This Clear coat is safe over all major brands of Decals
Tamiya, Fujimi, Aoshima, Studio 27, Cartograf, Scale Motorsport etc.