| 1mm x 1mm channels at 20mm intervals is not a huge amount of resin, and it increases the bonding surface. Still, every bit of weight saved helps.

You have mentioned the bonding surface a few times. Is that a real weak point? Have you had failures in this bond? I thought foam bonding is really about peel strength, which is not a load laminate sees.

Would scuffing the surface add more bonding surface with less epoxy volume?

1mm² every 20mm is 19x19=361 x 1000mm² is about a third of a liter, which is between ~ 400g and 700g per side of weight? Depending on epoxy density. I could not find a good epoxy density number.

| Be nice to lose the cost of the perforations as well, which would require a full grid on the table. Not a problem if the resin did stick to the part rather than in the grid, which it should if the grid is waxed. It should then come off the part with the peel ply except perhaps from the main channel.
| Although this could be less than the spiral as the table does not reduce the size of the resin path the way a bag does so maybe 5mm x 5mm instead of 12mm spiral. Not sure it would save any epoxy, but would definitely be lighter.

How about triangle or half round channels in the mdf?

Would you do one large perforation of the foam to get the epoxy to the channel? Or run the epoxy down the 5x5 along the spine of the table?

Does one need to worry about the laminate deforming into the channels? Even the 5x5?

Would larger moulds need more that one 5x5 channel? Or route it off the main spine every so often?

| The mould side of the infusion will show the grid for sure, which will require some fairing if a showroom finish is required. But if the grid is 2mm x 2mm, it should not be much. And, unlike scored foam, the pattern will not show through the paint as the boat gets older/hotter/stressed.

Ah, so the ugly product is prettier?

Why use 1mm² in the foam, and 2mm² on the table? Will 1mm on the table work?

| Infusing through holes in the table is not much different from infusing through the foam, and a lot more work.

Would you put one larger ( 5mm ?) hole in the foam to the mould channel? Or regular holes to the mould channel? Or feed from the ends down said channel?

| Something else to put on the list of things to try.

| Started glassing the ww hull of the mini cargo ferry today, looks OK. Beams are ready for mounting. Spars start tomorrow, along with some more glassing. Lee board and oar are built, Bucket List hull leftovers will do for the tramp until I get the plastic recycling working. Lack of machine tools/dislike of paying someone to experiment is holding this up, but using threaded rod and an alloy tube over the stove, the results are pleasing, albeit small.

What is this plastic recycling?