Hi friend, your work is extremely ingenious, I started making my own foil after discovering your videos, for those who don't want to bother with grease to hold the cellophane you can simply spray with the water on the surface works wonderfully, I'm impatiently waiting for the next version of the foil or other project, good luck from Brittany

There's a picture - somewhere on the internet - of someone standing on a pile of Clark foam concrete surfboard blank molds after the old factory was closed. Like they were all dumped in a pile. End of an era I bet Grubby Clark would love your efforts here. Nice work

how fiberglass boats are made. the mold is sprayed w release then everything is laid out in reverse into a mold. you can spray carbon and glass strand and its similar to how race sailboats are made. building up to the bagged foam core and using the foam curing slow heat to set the rest. you can make a core bag out of uline uncut bags. use a heat bagger to make the shape. The concrete's weight and the ability to use tubing to heat the concrete like a floor can make a great blank or foam base for sculpture. depends on the detail you need.. its what we did to make props for the film industry before silicone got made easy.. great vid man good luck!

Love it! I build Windsurfboards for myself and my boys, but never thought of creating my own mold. You just planted a seed 🙂

I have seen pretty much every video you posted. I must say you are absolutely talented. I have quite experience with composite molding and I would love to give you some advice. - Instead of using core Cement to produce the mold you could use other method which will give you best surface finish. It's the same steps you performed to mold out from original board. 1) instead of pouring the cement directly to the board, use a release agent (PVA) on the original board and make sure to apply several coats "3 is the best" and wait 15min between each coat. 2) Hand lay gelcoat (basically, it's a mixture of polyester resin and calcium carbonate, its thick creamy high viscosity mixture) directly on the surface of the original board apply two coats make sure it is thick enough "that would get you a superior surface finish". (the curing time is little bit faster than epoxy and so much cheaper). 3) After confirming the gelcoat is hard, apply 6-layers of fiber glass with polyester resin "Because the gelcoat itself is so brittle". 4) apply cement if you want in case you used expanded foam to produce the product, because the mold would be much lighter without it "you do not want inconsistent cross-section". you could use this mold to produce fiberglass carbon fiber, expanded foam, but before applying anything you have to apply 2~3 coats of release agent. the product wouldn't need any sanding or finishing and you could add color pigments to the epoxy.

The expantion depending from the moisture. Spray some water inside the mold. Good job, and great idea! Bravo!

I’ve come back and watched this video 3 times. I just don’t see how it doesn’t have 300k views. This process uses scrap wood, $15 in mortar and reinforcing mesh, and now you can crank out blanks for $20 dollars a piece. This is a game changer for any surfer with some know-how. I want to try a 4 lb or even 8 lb foam. Any thoughts on using a denser stronger foam with a lighter glassing schedule?

Ohhh man my Girlfriend is going to be so mad when I do this 😂😮😆🙌🏼 Thank You for the Video!!!

Pure efficient genius, this video will eventually change the lives of so many grommets around the world for good, congratulations. 7:02

You should be very proud of this device. And all your friends should be happy about the new boards they are getting

What a Great edit and tutorial! Thanks!

I can think of other things I can apply the mold creation process to. I didn’t know liquid foam was a thing, I assumed everyone was still starting with a solid foam block and shaping.

IT's a great! definetly i'm impressed! Please answer how many times the PPU expand? in my country there are several variants. one is 10 times, other is 17 times. which one will be better? Good luck you!

I bet you could do this using foam instead of concrete and then glass over it. Would weigh a little less when u were done! Nice work- much easier than shaping!

This is awesome, will you do another video where you glass and finish the board? Also, do you think the foam is going to be strong enough without a stringer?

Awesome video if I was looking at making a 12 foot paddle board foam would you run ply down mid was considering using your idea but just make a rectangular bit of foam with wood casing

What did you mix to create the foam? Ever thought about making a 2 part fiberglass mold for the blank? Awesome video thanks for sharing.

Hi, thank you for the great video. I was wondering how you calculated how much foam you need? Maybe you can help me out

Thank you su much

What do you think of first applying carbon fiber cloth and epoxy (or fiberglass and polyester resin) to both sides of the mold first and then filling it with foam? The next step would be a strip of cloth and resin to connect the two halves. Thanks for the video!

Do you think polyurethane is good for surf, someone tell me it desagregatebwith humidity

hello! this is a great video! I will try too! What are the two materials you applied after the concrete had hardened? A clear liquid applied with a brush and a yellow cream applied with a towel.

Quantos ml de expansivo você usou???

Nice 👍🏻

So can you explain what products you are using to prep the mold please I'm so interested in making white water sups and this could really help the journey

Can you redo these videos a and add commentary???

C'est Super Ça ! Qu'est ce que vous faites après ? Vous le stratifiez ou vous allez direct sur l'eau en espérant que ça tienne ? Plus J'ai suivi avec attention la construction du petit kiteboat. Que devient-il ? Une autre vidéo bientôt ?

🤣😂🤣🤣 building a surfboard from a mold.