Talk Composites - The Forum for Advanced Composites

Water Marks In Carbon Fibre?

http://www.talkcomposites.com/Topic40069.aspx

By dilligaf76 - 4/16/2021 7:10:09 AM

After doing a bit of carbon fibre skinning on my motorcycle I was pleased with the final result but after I washed the bike a few times it seemed to leave behind some water marks within it.
I sanded the part down again and then decided to lacquer it and that solved the problem but I didn't think I would have to do this?
I thought that once the resin had cured it would be water proof so I don't understand why it has done this, can anyone explain why this has happened.?
By Warren (Staff) - 4/16/2021 3:37:27 PM

Also if it was relatively fresh as a part, if the epoxy isn't quite fully cured it is also more vulnerable to moisture absorption on the surface which in minor cases can cause a similar effect. 

I certainly agree some kind of wax or automotive type sealant is useful for long term protection from the elements and road grime on carbon parts.  Even basic automotive "wax" type products used on a semi regular basis will help.