pressure relief valve with alarm system

You could use pressure sensors to even warn you before the pressure is to high. You could also use mechanically activated limit switches.

now that's a very easy process for you to build it your self or buy it. All that makes up that is a led circuit,buzzer,indicators depending on the projected need to monitor liquid,gas,or solid you will have to decided. A simple circuit design like that can be very cheap if this is a company needing this. However you will need to calculate your pressure so you can design for its need. If you would like help post your issues or contact information and i can help you design it. It's very simple.

Hendrik said it correctly. Fit a Buzzer with a revolving light for the Operator.

What is the viscosity and temperature of the product? How fast does the resin solidify? Any flammable issues with the product?