The simple answer is yes, it is advisable to varnish your decal, for a couple of reasons One being that if the model...
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Large fine brown ballast
Extra fine tarmac ballast underlay - 1200mm X 300mm (12in. X 48in.)
Realistically model railroad track, crushed rock and stones. Easy to use and colorfast. For any scale.
Realistically model railroad track, crushed rock and stones. Easy to use and colorfast. For any scale. Bag : 21.6 cu in (353 cu cm)