Pinholes on surface


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LeeBrett
LeeBrett
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Hi guys, I am still learning and I have been using a small mould as a test.  I have just pulled my small money tray made of 2x2 twill carbon out of the mould and there are tiny pinholes on one side of the surface, I am sure that the bag kept full vac all the way through the infusion so my question is what are the main reasons for a pinhole finish. 

I have been working in the garage which is cold but have my mould on an electric blanket to keep it warm.  the only thing different with this infusion is that I didn't use any spray tack on the surface. 

I am quite happy to have these little problems as I want to learn as much as I can but I need to have an understanding of why things happen and how to improve.

Thanks in advance

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MarkMK
MarkMK
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A little hard to tell from your pic, but the surface finish does look a little resin starved (unless your mould surface is not that glossy?).
Yes, just placing flow media 3/4 of the way across and also placing a strip under your exit line to help with airflow away from the part might just help to slow everything down and allow time for the part to wet out thoroughly. No harm in letting things infuse a little longer than normal and, perhaps, letting some resin flow to the catch pot just to be confident of a thorough infusion

Make sure that your mix of fast/slow hardner to resin allows you enough pot life, however, especially if taking additional time to de-gas first.

 A 50/50 mix of fast/slow hardner should give you at least 30 mins or so in all but very high ambient temperatures
GO

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