Can FMG be patched?

Article courtesy of Smooth-On, Inc.

Forton MG can be patched or pieces joined together by using the same slurry mix, surface applied to the problem area or the area to be joined.  The areas to be patched should be roughed up with sand paper and be dust free prior to the patching or joining process.  In patching, the mix will go through several viscosity stages, fluid to paste like.  When the mix is in the paste-like stage, it can be worked and shaped with damp fingers or tools.  When it has hardened, it can be sanded, filed or ground to match the original. Note: when patching or joining metal powder filled pieces, do not sand the patch or joint.  Always overbuild the area and work it down with files or a Dremel tool. When joining pieces, the joints must be bandaged with glass fiber and slurry mixture from the back.  Then the face of the joint can be patched as above.


This FAQ article is offered as a guideline and offers possible solutions to problems encountered during mold making and casting. No warranty is implied and it is up to the end user to determine suitability for any specific application. Always refer to the provided Technical Bulletins (TB) & Safety Data Sheets (SDS) before using any material. A small scale test is suggested to determine suitability of any recommendation before trying on a larger scale for any application.