Removing the Vacuum Bag: What Good Consolidation Actually Looks Like
The bag came off well. The breather felt was saturated with bleed-off — more than ideal, which means slightly more resin went in than necessary, but it also means the laminate was fully wet out before the vacuum did its job. The frog’s tongue had done exactly what it’s there to do: resin had tracked along it and stopped well short of the valve. Nothing in the pump.
Peeling back the stack in reverse order — bag first, then breather and perforated film together, then peel ply — the laminate underneath was exactly what you want to see. The carbon had been pressed firmly into every corner, including the complex concave where the beam meets the hull. No bridging, no dry spots, fibres consolidated right into the geometry. That’s the whole point of the pleating and the segmented consumables in the previous video — it works, and here’s the proof.
The peel ply left a slightly resin-rich textured surface that needed almost no sanding before filler and paint. That’s one of the main reasons you use it. You’re not cutting into the carbon fibres trying to create a key — the texture is already there.
The pile of single-use plastic going in the bin is the part of high-performance composite work that doesn’t sit comfortably. The vacuum bag, the breather felt, the perforated film — almost all of it is landfill. The bag in particular can’t be reused safely because cured resin embeds itself into the plastic and the sharp edges will puncture it under vacuum. It’s a real environmental cost and one the industry hasn’t solved. We note it because it’s honest, not because there’s currently a better way to achieve this level of consolidation.
Next step: filler, sand, paint. Black, because that’s what was in the locker.
The full vacuum bagging process — consumable stack, pleating technique, why bridging matters — is covered in the previous post. If you want to go deeper on composite technique, the members’ technical library is where we cover the detail. Join here.