Yes, you can use TotalBoat Thixo thickened epoxy adhesive to form strong bonds to Masonite, also known as hardboard.

When bonding Masonite with Thixo, follow the surface prep instructions for wood substrates, since Masonite is a type of engineered wood made by heating and compressing a mixture of wood fiber, resin, and glue.

When clamping, be careful not to apply too much pressure so the epoxy doesn't get squeezed out of the glue joint.