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Mold release method for FG or CF repairs.


David Hall 9
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I have to repair a couple of my moldie F5J gliders, each with damage to the leading edge, with a chunk missing back to the spar.   Fortunately, the structure is still sound enough, so I simply need to fill and the skin the wings (one is glass fibre, the other is carbon fibre skinned.  

For the point at which the wing repair is skinned, I have previously applied CF/GF cloth and sanded down the lumps later.    

This time, I plan to apply a plastic sheet to the wet cloth and hold in place/shape to give the cured cloth a smooth finish.  

 

Can anyone recommend a suitable treatment for the plastic (Acetate/PVC) sheet to release the cured resin?  ..    Recent efforts with furniture polish have only been partially successful with many specs still stuck the the sheet when removed.     

 

 

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When moulding glass or carbon fibre my release agent is two-stage.  First there's the wax, which I think is simply beeswax, then there's a liquid pva release agent like this one https://www.ecfibreglasssupplies.co.uk/product/clear-matt-pva-release-agent brushed on and allowed to dry.  It's water soluble, so is easy to clean off the finished item.

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Thanks for the info...      It occurred to me that, if I use a sheet of (prepared) acetate as the external surface that will give the CF/GF wetted fabric it's shape and finish,  might I be better applying the resin and fabric to the sheet, then holding the loaded sheet in place on the wing until set.   That would give it a smoother finish?  

 

 

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