Just commenting to show some love. Just came across your channel and now I’m going to binge watch all your videos. I’m surprised you don’t have massive amounts of viewers...yet. Thanks for everything!

I've been watching a bunch of your videos and I really enjoy all of the testing that you have done. Lots of great info for beginners and experienced folks alike. I'm a huge believer in learning hands on. One of your videos, you mentioned your vacuum gauge was reading off after you let air in quickly and you suspected epoxy in the valve. I had a similar thing happen to me, except, by some fluke I saw a rubber cap on the top of the gauge and thought it may be a calibration screw or something... In an attempt to remove it with my finger, I heard a hiss noise and the gauge went to zero. Not sure if this is a fluke, or if this is a way to calibrate the gauge to elevation by equalizing pressure. Maybe it was a total fluke, but I thought I would share the story with you.

Hi Leon, just found ur series of vids on carbon laminates. Love ur methods for testing infusion, sandwich, finish and strength! Haven't seen them all yet so u might have tried this already, but have a couple of thoughts. Have u tried glass tissue as ur first layer on the mould? Maybe it will give an internal flow medium to fill the last pin holes on the surface making that a bit more resin rich without adding too much weight. And u probably won't see it as the tissue refractive index will make it 'disappear' in the laminate. I wonder if that might work if u used it as an additional internal flow medium across the foam core? I saw another comment somewhere to put a layer of resin on the mould before u lay it up and bag it but that might be risky as the clock is ticking before u start bagging it. Have u tried hand laying it up, then bagging it and vac out the excess resin? I'm like u, worked with grp many moons ago and have a rekindled interest in carbon and vac. When I can get back to Europe then I'll go through a similar process u r going through. Interested to keep following what u r doing and what u do when u get into elec motors, and batteries! Keep up the good work!

When you have leak it will reduce the pinholes sizes because of more pressure on the resin.

I also have a question, and thought I would post it separately. I have never done infusion before, and am jumping in some what recklessly. I am attempting a 6mm (1/4"ish) lamination with 16 layers of 6 oz 3k 2x2 twill and 2 layers of unidirectional 22.3 oz. Layers will be 5 twill, 1 UD, 5 twill, 1 UD and 6 twill. From what I have seen your testing has all been with thin laminations, but I think your experiments with core material may have some parallels to thicker laminations. I have watched many of your videos several times... so I'm not asking this in ignorance, but because I value your hands on experience. I'm concerned about the material not wetting out completely. My thoughts are that I should use a restrictive flow media (media substitute) to encourage flow through the cloth. I remember you saying that you had issues with UD not flowing well as the flow path is through the tows. The end product will be carbon fiber, but I intend to attempt this part first in fibreglass with similar cloth. The resin viscosity I intend to use is 920 cps and has a pot life of about 75 minutes in the required volume. Any advice would be appreciated !

Stretchlon 800 is much “safer” then the 200 when trying to avoid punctures from the flow media.

As long as you restrict fluid inlet just a bit is enough

Thanks for the great video, I found it very helpful. I am just learning how to infuse composites...I don't have any peel ply, wondering if I could substitute something else? The peel ply must be porous to allow epoxy to flow through it, right? how does it not also become infused in the layup? what are the purpose(s) of peel ply? Ive read its to even out vac pressure & help release, is that it?

Sir can you show calculation of resin needed

Anyone could u tell me if it might happen degassing processes in the vacuum bag during vacuum infusion proces (gaugein 30 inch hg) that can make aerating the resin. Or we have to lower down the prsure to 27unch hg.