Johnsons Kleer otherwise known as Future is the stuff to use. As i keep telling everyone it has a million and one uses including mounting your decals.
Before using Future to seal your model with it is important that the kit be clean and free of any oils such as fingerprints. All coats of paint should be allowed to cure (dry) for at least 24 to 48 hours (especially enamels) before applying Future. The sealing coat of Future (usually one coat is sufficient) should be allowed to dry for 24 to 48 hours before applying decals. After decals have been applied and everything has dried completely (24 to 48 hours) you can apply a dull or flat finish safely such as Testors dull coat lacquer or Polly Scale clear flat. Testors Dull Coat is a lacquer so it should be applied in light coats to avoid orange peel.
Wet your decal as usual in water, but before it goes to the model, dip it in future. It works well and does away with the need for Micro-Sol/Set or similar setting agent. The only downside I have noted is that the Future goes tacky quite quickly and can cause a few problems if you are still trying to place/adjust the decal at that time. The upside is that it pretty much ensures no silvering.
Hope that helps.
Bazza xx
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