Just debagged a deck moulding and there are a couple of white, dry-looking areas up near the vacuum side. The rest of the part looks fully wet out and solid. What causes it to starve right at the end like that?
Dry patches close to the vacuum line usually mean the flow front stalled or the resin gelled before it fully reached that region, so it is often a timing or pressure issue rather than a layup mistake. Common causes are the resin thickening before the front arrived, a small leak near the vac line pulling in air and blocking the front, or the vacuum line being clamped too early so that last area never got its feed. Racing gel time is the usual suspect on larger parts, especially if the shop was warm. Check whether the dry area lines up with a fitting or a tape join, which would point to a leak, and compare your gel time against the actual fill time. If the wet-out worries you structurally, a cut-up or a proper laminate assessment through materials testing will tell you what you are really dealing with. Logging fill time on the next part will show how much margin you actually had.
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