we are currently manufacturing new masters for our new moulds. The master are made out of wood using carpenter style methods. The woods is finally coated by several layers of two types of glossy finishing paint. The inner layers are nitro based while the last layer is melamine based.
We wax then always five layers of Mirror Glaze #8.
This combination worked in all our trials of some 0.5m x 0.15m.
To make sure that larger pieces do not stick, we add additionally a PVA release agent.
When taking off the polyester laminate, we experience randomly problems. Small spots (some mm only) connect the laminate with the wood but the surface of the laminate if damaged.
Personally, I am using Mirror Glaze #8 since 2005/6 without these problems in very different environments.
To make matters worse, we faced the same problem now on one polyester mould which was taken off a polyester master.
Do you have any idea what we are doing wrong?
Is there a technical data sheet for Mirror Glaze #8 available on-line?