fixing of pinholes and other surface imperfections.
fixing of pinholes and other surface imperfections.
(OP)
I am using West Systems Epoxy 105 with special clear hardener. I made a mold of a motorcycle chain guard and vacuum baggeda carbon part. The molded surface of the part is not SMOOTH. I tried sanding it a little and brushing more resin on to fill voids but the resin resists voids like the plague. Resin builds up fine where there is already resin but does not want to fill pits.
Any remedy?
Any remedy?





RE: fixing of pinholes and other surface imperfections.
RE: fixing of pinholes and other surface imperfections.
Lower viscosity resin may help. This can be done by adding solvent or heating with a heat gun (hair dryer), or both. Heat will expand bubbles, particularly if solvent is present. If they pop and the resin levels your pit is gone. Acetone is usually the best solvent for epoxy, but with some formulations it may interfere with cure.
It is better to make parts without pits in the first place.
RE: fixing of pinholes and other surface imperfections.
Lowering the viscosity sounds good. Didn't really have this problem with poly-ester resin.
Guess I didn't use enough resin to begin with?
RE: fixing of pinholes and other surface imperfections.