Why are there fibers/crystals in my Armour Etch Cream?
It is the nature of Armour Etch Cream to contain particles (crystals). The particles are necessary and add proper potency for Armour Etch to work properly. Occasionally hot spots (darker etched areas) develop when these crystals are allowed to remain in contact with the glass. It is recommended that you continuously brush Armour Etch around while waiting. Use your brush to move these particles to an area of the stencil where there is no design. If Armour Etch contains too many crystals or fibers, place the entire CLOSED bottle into a warm to hot bath of water a few hours before using. Remove jar occasionally and shake well to re-blend the etching cream.