You certainly cant use the same ratios for volume as for weight. Reading from
the technical leaflet (you get one with each pack of resins) the volumetric
ratio is 100 resin to 29 hardener.
We have ben using a Spruce and Speciality resin pump for two years with no
problems. It is a variable ratio one which was just as well since the factory
changed resins 18 months ago and we had to re callibrate ( a bit of a pain
since you have to flush out all the old resin since solvents are a no no -
rubber seals etc). Still hopefully the type of resin wont change again, but
then you never know !
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