Talk Composites - The Forum for Advanced Composites

2nd infusion, help needed

http://www.talkcomposites.com/Topic18969.aspx

By Eeskidmark - 8/9/2015 5:14:03 PM

Hi all,

I have just done my second ever resin infusion on a small part I have.

The finished part is very strong, with 6 layers of CF, but the surface finish is not what I expected. 

I am starting to believe it is because the mould has sharp 90 degree edges so the fabric cant get right into the edge. But the fabric has also held off on other areas, and the resin looks like it has been spread to thinly. I used some 3m 77 spray glue, but i only used a very fine mist to help it stick to the mould. I also worked the fabric the best I could into the edges whilst i was pulling a vacuum. 

I did have a good vacuum as I clamped the hoses and left it for 20 minutes and the needle never moved when I released the clamps. 

I have attached some pictures, would anyone be able to give me any pointers on how to improve the surface finish, should I be using a clear coat?

I think I can save the part with a bit of sanding and a clear coat of lacquer. The mould possibly needs polishing but I was only going to do that once I have the technique right. 

Thanks

http://www.talkcomposites.com/Uploads/Images/676786f4-7d38-4155-b852-6c39.JPG
http://www.talkcomposites.com/Uploads/Images/8d3cdefe-61e9-43af-a4a6-66ca.jpg
http://www.talkcomposites.com/Uploads/Images/1add5888-dbdd-4fc7-af6e-10e1.jpg
http://www.talkcomposites.com/Uploads/Images/d4199720-ea20-448b-b722-aa4a.jpg
By Eeskidmark - 8/10/2015 8:13:14 PM

Ok, thank you.

I will have another go bearing these points in mind.