+x

 

chriscnf - 12/2/2020 6:02:03 PM

Hi guys...I'm using a three part epoxy mold which I inflate with a bladder. The flanges are pretty smooth based off polypropylene board and a quick polish but I still get a build up of thin resin film on the flanges that  is a witch to remove. My release process is zyvax sealer and Zyvax release 4 with a dusting of hairspray as a lazy substitute for pva. (The spray gives my parts a slight texture which is desirable).
Clean up is to throw the mold in a water bath for a day. I wonder if the long soak if effecting the zyvax but my parts pop out from a complex mold super easily.
Maybe a build up on the mold flanges is just normal...it polishes off ok but that's all extra work.

+x

 

Lester Populaire - 12/2/2020 8:27:16 PM

+x

 

chriscnf - 12/2/2020 6:02:03 PM

Hi guys...I'm using a three part epoxy mold which I inflate with a bladder. The flanges are pretty smooth based off polypropylene board and a quick polish but I still get a build up of thin resin film on the flanges that  is a witch to remove. My release process is zyvax sealer and Zyvax release 4 with a dusting of hairspray as a lazy substitute for pva. (The spray gives my parts a slight texture which is desirable).
Clean up is to throw the mold in a water bath for a day. I wonder if the long soak if effecting the zyvax but my parts pop out from a complex mold super easily.
Maybe a build up on the mold flanges is just normal...it polishes off ok but that's all extra work.

The best way i found was using compressed air to get rid of the majority of the thin film and then use some masking tape to pull off the remaining little bits. No soak or anything.

+x

 

Warren (Staff) - 12/8/2020 10:05:33 AM

I have found that with a good semi-permanent release agent, the air gun trick works well or a flat edge plastic bit of card is enough to knock it off and get you back to a clean surface.