How do you dissolve epoxy glue?

Answer 1

For big projects there are commercial products like "Dynasolve 165" available at http://www.dynaloy.com. Their products are custom formulated for specific epoxies and applications. Their service seems great, but their prices for small quantity orders (1-qt) are not inexpensive.

Methylene chloride (aka dichloromethane) is reported to soften epoxy over time, especially is certain blends with alcohols plus detergents.

There is a US Patent #4278557 for a mixture of 45% by volume methanol, 40% by volume dichloromethane, and 15% distilled H2O for dissolving & removing epoxy resinous compounds. see http://www.freepatantsonline.com/4278557.html

Dimethylformamide (DMF) attacks epoxy more aggressively than methylene chloride

There is a relatively inexpensive blended product called "Attack" that consists of DMF in acetone. It claims "dissolves epoxy and polyester resins" and reportedly works well enough on most epoxies, though probably more slowly than the Dynaloy products.