Assertion: polyester resin | /r/HasProperty | recommended
Facets:
value: often
type: TEMPORAL
Source sentences:
text: When working with polyester resin it is often recommended that if a substantial amount of filler is used the percentage of catalyst added should be increased from the usual 1% to at least 2% (even up to 4% if mixing small volumes) in order to compensate for this and speed up the setting.