Hello,

can you post a picture?

Do the dry spots match the areas you used the adhesive?

What is the layup?

How long did you pull the vacuum for before you infused?

How fast was the infusion?

Does the infusion mesh run right to the outlet or does it stop then have a dam of peelply or similar?

What is the temperature?

Lots of questions I know but it could be any or a combination of the above (and that list isn't exhaustive!)

The adhesive, I finely mist on the whole carbon fiber fabric and fiberglass mat.

The layup consists of 5.7oz 2x2 carbon fiber, 6 oz fiberglass mat, peel ply b, airtech green infusion mesh, vacuum bag: using polyester surfboard laminating resin (unknown viscosity).  Also used systemthree mirrorcoat epoxy (700 cps) but had almost the same result, but slightly better (still had a lot of dry spots).

I pulled vacuum to test the seal for at least 20 minutes with no leaks.

As far as how fast was the infusion, since it is a small part, it infuses through in no more than 2-3 minutes.

I put a peel ply break that is little more than 1" after the infusion mesh.

Temperature out here in hawaii is roughly low to mid 80s*F when infusing.

Setup while infused:


Left is systemthree epoxy and right is polyester laminating resin which both have dry spots


Closer view of the polyester laminating resin dry spot

Are you referring to the circles or the bridging on the corners?

Neither.  Those circles were there to be drilled out after I made the part.  Don't mind the bridging in the epoxy picture.  It was just a reference to see how the finish on the flat side was compared to the polyester.

Are you sure it's actually dry? Or is it just matte?  Can you take a photo closer up, so we can see the fabric better? The polyester one does look a bit dry, but the epoxy ones all look ok. 

You'll probably just find that the laminating resin just isn't a low enough viscosity, infusion resins are typically less than 500 at 20-25deg and some less than 300, typical laminating resins are between 500 and 1000 so it may just be too high viscocity

Hi guys i'm having the same similar issues but i dont have any voids nor pin holes, see pics on the following link. Has anyone has this sort of experience with adhesive sprays. Ohh i have two sprays [Airtac2 and 3M ACPS] and the results are the same . i wish there was a way i could do away with the adhesive but im forced due to the shape of my mold, how are you guys doing it.

In the picture of the infusion are you stopping the resin feed at that point? Some of the cloth still has to wet out. I know its off the part but if you stop the resin feed at that point the resin that has been absorbed will continue to migrate into the dry cloth during curing leaving the rest of the part starved of resin.

Warren

Carbon Copies Ltd