Second mold, new issues :-)

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Second mold, new issues :-)

Second mold, new issues :-)

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Massimiliano	M Massimiliano posted 5 Years Ago HOT Topic Details
M Group: Forum Members Posts: 167, Visits: 1.1K	Hi, after the first not successful mold and part (http://www.talkcomposites.com/Topic36543.aspx) I worked on the part to fix the issues in order to build a new mold. This time the part popped from the mold almost by itself but... something has happened to the tooling gelcoat! Please se pics. Last pic is the tooling gelcoat on the base glass, so I tend to exclude some interaction with the plug. Any ideas? Attachments 20200814_151808.jpg (165 views, 1.00 MB) 20200814_152504.jpg (162 views, 2.00 MB)
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Second mold, new issues :-)

mporta71 - 5 Years Ago

So your flange material was glass? It certainly wouldn't be a reaction to glass. The gelcoat looks very very thin so it almost looks like the gel has lifted, either due to trapped air or possibly th...

Warren (Staff) - 5 Years Ago

Hello Warren, I don't think it is too thin, I would say rather the opposite... I applied the first coat with 1% catalizer and after 5 hours some "ponds" were still too tacky so left overnight. The.....

mporta71 - 5 Years Ago

If you look at your second attached image, you can see the strands of fibreglass heavily printing through the flat gelcoat to the right. That might be a side effect of the reaction you have had but.....

Warren (Staff) - 5 Years Ago

Thanks... hope my third mold would be better :-) Do you have any suggestions on how to fix this mold?

mporta71 - 5 Years Ago

Anyone has suggestion on how to fix this problem? Just apply new gelcoat? Is there any way to apply it the "flattest" possible?

mporta71 - 5 Years Ago

I think the fastes way would be to redo whole mould from scratch. 1% catalysts seems way to low for gelcoat (i always go with 2%). Peehaps first layer didnt cure and then second layer pulled it a bit...

beliblisk - 5 Years Ago

Thank you... I will try on one damaged area and see how it will go... then decide to redo it for the third time..😒

mporta71 - 5 Years Ago

You are welcome. I tend to take every failure as a learning process...... just keep it up and you will get there eventually:)

beliblisk - 5 Years Ago

Yes you are right, first mold plug did not release properly as there were some slight undercuts. Also while applying the tooling resin I mixed too much in one pot so it started to gel before finishin...

mporta71 - 5 Years Ago

Gealcoat wont gel on you to fast opposed to coupling coat and tooling resin (with both of these i go just above lower limit for catalyst and mix amounts i can use in the next few minutes). When...

beliblisk - 5 Years Ago

Definitely yes! Thank you!

mporta71 - 5 Years Ago

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