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Frequently Asked Questions

We have questions and answers to help you decode the terminology and the fundamentals of mouldmaking and casting.

  1. What colours and finishes are possible with FMG?
    A variety of colours and finishes can be incorporated into the FMG face mix. UV stable liquid or dry powder pigments can be added to FMG to provide a vast range of colours. Aggregates can be added to the face mix to achieve desired texture effects when sandblasted and sealed. Metal powders can ...
  2. What are the set, demoulding and curing times for FMG?
    Set time is the time when the slurry loses workability and begins to stiffen and set - also referred to as working time. Using a typical alpha product formulated for this process, set time will be 20-30 minutes. Set time can be shortened with accelerators or lengthened with retarders. Without ...
  3. What type of glass fibre is used in FMG?
    Continuous strand veils, commonly used in GRG, are also most often used in FMG for architectural ornamentation. Standard E-glass fibre used in FRP can also be used in the form of chopped strands, chopped strand mat or continuous strand mat. A minimum of 5% by weight of glass fibre should be used ...
  4. Can I use any gypsum plaster for FMG?
    While VF-812 will improve the properties of most gypsum plasters, FMG requires the use of alpha hemi-hydrate plasters formulated for a low water/gypsum ratio. Most commonly used in the US is Hydrocal® FGR-95 from USG, which is specially formulated for architectural ornamentation. Also used are ...
  5. What is FMG?
    FMG is short for Forton Modified Gypsum or Forton MG. It is a unique combination of high-strength alpha hemi-hydrate gypsum with water based polymer chemistry that is reinforced with "E" glass fibre. FMG is the first technology to make gypsum an exterior product, when painted or sealed. It's a ...