Talk Composites - The Forum for Advanced Composites

First part not totally released, clues needed

http://www.talkcomposites.com/Topic36543.aspx

By mporta71 - 5/10/2020 9:29:41 AM

Hi, I made my first part out of my first mould.
99% released fine but for some small areas where the tooling gelcoat merged with the gelcoat, please see pics.

I need your expert advise to understand what I did wrong not to repeat.

Mould made on Sunday, removed from pattern on Monday.
Left to rest until Thursday.

On Thursday, compounded with nw1 and polished with topfinish2.
Cleaned 2 times with ec mold cleaner.
One additional cleaning with acetone.
6 passes of Easy Lease every 15 mins
2 additional passes of miracle Gloss framed 15 mins
Left overnight to rest

On Friday two layers of white gelcoat framed one hour then hand layup with polyester laminating resin.

Demolded after 24 hours. It released pretty fine (with a bit of compressed air) but for the spots.

Any clue about what happened?
I think it is almost impossible I missed 6+2 times just those few spots...

Thanks a lot
By mporta71 - 5/11/2020 11:45:37 AM

 
oekmont - 5/11/2020 11:24:59 AM
I would take a new mould from the existing part. After removing the chips, some sanding and polishing it should be fine to take a new mould from.

Thank you!