A recent publication from Montanuniversität Leoben, Austria, describes the use of Flowires and Optiflow for the accurate measurement of the resin arrival time in realistic shape RTM moulds. More details can be found in:

Spiridon Konstantopoulos, Christian Hueber, Elisabeth Mühlbachler &
Ralf Schledjewski (2016): Identification of the effect of typical curvatures encountered in RTM
parts on localized permeability of fibrous preforms, Advanced Manufacturing: Polymer &
Composites Science, DOI: 10.1080/20550340.2016.1229829