Hi All,

I'm a beginner in Composite World.

I created a mould from a bonnet from a reacecar.


So far, so good.

Next step was to create a carbon fibre bonnet.
First I used several coats of easy lease Chemical Release agent on the mould.
Then, I did one layer of GC50 Epoxy Compatible Gelcoat. I used 2% MEKP hardener, maybe a little more.
Then, I did One layer of 200gr Carbon Fibre, 2mm Lantor Soric core material, and then again a layer of 200gr Carbon Fibre.



Next was all necessary thing for vacuum bagging., as shown below;.



The day after I removed the peel ply, and took the bonnet out of the mould.



But then I saw the GC50 did not stick to the EL160 resin. I could peel it all off !!



Which resulted in this on the floor !







this leave me with a bonnet with a very wavy surface !





Question1 : What did I do wrong?
Question2 : How can I repair this?

Thanks,

Gerry.

Its either the cold that has effected the bond strength or not leaving it long enough before demoulding.  EL160 needs a minimum of 24 hours at 25C and your temperature was considerably below that.  Demoulding green can effect bond to GC50 as can generally cold conditions. So it could be a bit of both.

Leaving GC50 over night  is typical so i doubt that was an issue .

Giving the surface a key is sanding the surface.  240 grit will be fine, just ensure you don't sand too far  and break into the carbon ruining the weave pattern.


Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant

For anybody who wants to know how it turned out : Is was OK.

See this google photoalbum for the full story so far.

Thanks Easy Composites, thanks Warren.

Gerry.