Preparation and Mixing
Paraloid B-72 comes as solid pellets or powder that must be dissolved in an organic solvent before application. The resin is mixed with solvents like acetone, ethanol, or toluene to create a solution. Common concentrations range from 5-10% resin by weight, meaning 5-10 grams of Paraloid B-72 dissolved in 90-95 grams of solvent. The mixture should be stirred thoroughly until the resin fully dissolves into a clear or slightly amber liquid.
Brush Application
Brushing is a common method for applying Paraloid B-72 to smaller objects or detailed areas. A soft brush is dipped into the prepared solution and applied in thin, even coats across the object's surface. Multiple thin coats are preferred over one thick coat because they dry more evenly and create a more consistent finish. Between coats, the object should dry completely, usually for several hours.
Spray Application
Spraying allows for more uniform coverage on larger objects and creates a thinner, more controlled coating. The solution is applied using an airbrush or spray equipment in light, even passes across the surface. This method requires proper ventilation because the solvent fumes are strong. Multiple thin spray coats are built up gradually rather than applying one heavy coat.
Immersion or Dipping
For smaller objects that need complete coverage, immersion involves dipping the entire object into a container of the Paraloid B-72 solution. The object is held in the solution for a few seconds to allow the coating to form evenly, then removed and hung to dry. This method ensures the entire surface, including crevices, receives protection. Excess solution drips off as the object dries.
Drying and Safety
After application, objects must dry completely in a well-ventilated area. Drying time typically ranges from several hours to overnight, depending on coat thickness and environmental conditions. The organic solvents used are flammable and have strong fumes, so applications should occur in areas with good air circulation and away from ignition sources. Protective equipment like gloves and eye protection is recommended. 
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