Apply a thin, even coat beneath each stamp and a whisper-light layer on top only after it grips. Roll gently with a brayer while supporting delicate paper with parchment. If bubbles appear, pause, lift carefully with a knife tip, vent trapped air, and smooth again before committing with additional medium.
Some inks are water-sensitive and may blur under aggressive brushing. Test suspect stamps separately. If edges feather, pre-seal with a mist of clear archival spray. Use minimal strokes, working in one direction to avoid scrubbing. When in doubt, let moisture flash off briefly before laying a protective top pass.
After thorough drying, build multiple thin topcoats, allowing proper cure between layers. Matte finishes feel vintage and forgiving; satin balances glow and subtlety; gloss amplifies color depth dramatically. For tabletops, finish with a durable water-based polyurethane. Always sand ultra-lightly between coats to maintain clarity and avoid cloudy build-up.