For infusing a large flat deck, is grooved and scrimmed foam worth it over plain sheet?

For infusion, grooved and scrimmed core usually earns its keep, especially on a large panel. The grooves act as flow channels that let resin travel across and through the core, so the resin front moves faster and more evenly and you are far less likely to get a dry spot stranded in the middle of a big deck. Plain unperforated sheet blocks flow through its thickness, which can leave you racing the gel time on anything sizeable. The trade-off is resin uptake, because those grooves and perforations fill with resin and add weight, so an aggressively grooved core drinks more resin than you might expect. For a big flat deck the flow security is normally worth it, so pick the lightest groove pattern that still reliably fills. Matching the core to your infusion strategy and consumables is something we are happy to talk through, and you will find the flow media and fittings under vacuum bagging and infusion consumables.