Hi, iv made a couple of small infusion part about 6inch long by 2inch.

Although the weave is nice and straight and no imperfections it isn't compressed nicely and can see gaps in the weave.

Mould was gel coated and left to cure, and then carbon laid with a mist of 3m 77 spray.

Also tried pro finish carbon.

Im thinking it's either glue on the carbon stopping it compressing in to place, or infused to fast because it's so small.

Resin is In2 fast

Any ideas.

Thanks

I think you have the same isseu as i had the first few times.

Infused to quick. I think.

Im a beginner allso. And i can remember verry well i did look and was amazed how fast the resin flowed. 

After a few trys i started looking a bit further and found to fast infusing traps small pockets of air in the dents of the material.

When you say 'gappy' I'm guessing that it was gaps in the tows of fabric itself rather than dry spots or voids in the epoxy? 

If the small mould has return edges, then it could just be the way the fabric's been laid into the mould or that your fabric was a bit loosely woven to start with. A 240g twill is usually a bit more tightly woven and stable than most 200g fabrics, so using this might help.

It's always best to try and place the fabric down into the centre first and gently work it outwards towards the edges to help avoid it being pulled apart too much. Making sure it's in close contact with the corners and edge returns before applying vacuum will also help to stop the centre being distorted as vacuum is applied and you do any finally working of the bag into the corners.  

As mentioned already, though, if it's a problem with the surface finish, then slowing the resin flow down and leaving the inlet side open for a short while after everything appears to be wet-out should help deliver a perfect surface finish

I've encountered a similar issue where the crowns of the weaves weren't flattened, like they are on most high-end OEM automotive carbon.  First time this happened, the resin feed went too long before it was clamped off.  MTI hose was used so the excess resin couldn't flow out.  This seemed to reduce the vacuum pressure in the bag.  this resulted in a very nice surface finish but no tow compression.  Next attempt, the resin feed was shut off a few minutes prior to full wet-out.  the result was flattened fiber...just what i was looking for.

Hope that helps!