So its NOT the "motion of the ocean" then.

I ordered some rubber and resin today for the first time because I finally have a project need to duplicate a simple part. Fingers crossed that having watched all your videos will help it not be a colossal failure in the minimum number of attempts.

Hardener 1st, rubber 2nd, I'd never even heard of this tip - cheers mate.

Small detail I noticed while filling the star the second time you can see a small air pocket get stuck and bubble out (around 6:38). I found that really interesting to see and watch. It gave me a better view on why I sometimes get bubbles close to my pour spouts.

It was insanely informative to be able to see how the resin behaved as it filled up the mold. 🤯

wish you made this video last year, that's exactly what happened to my first big project. The sprue was way too small and it cured with only maybe 10% of the mold full. Thank you so much for continuing to make excellent videos.

I work with sculpture in my country and also make molds for it. I love watching you, Mr. Robert. You have a different and distinctive style of work. Greetings from Jeddah, Saudi Arabia 🌹

Loved watching the resin cure through the "window". Though "cutting in" vents gives me flashbacks of ruining resin/rubber/sculptures at the same time. As always thank you

So fullfilling to watch the resin fill up the mold then watch the resin harden. Nice work Robert!❤

this is such a good idea to show how a mold fills up! I always try to imagine what happens inside a silicone mold, but it is very difficult. This made it a lot easier!

I love seeing the mold fill. It would be interesting to try it again with the vents plugged to illustrate why they're needed.

I loved watching the mold get filled. I’ve always had trouble visualizing what was actually going on and how the sprews would work in the mold. This answered all my questions about that! 😄

This was fantastic to watch. At 5:30 I was thinking that if you were to add some sort of suction from the other two vents would help the flow/fill, but clearly a larger funnel proved to be a lot simpler.

What a spectacular explanation! Especially for someone who "thinks visually" 😅 Thank you so much sir!

Wow. I feal like I learned a lot in this video! Actually seeing how the resin filled up the mold gave me a better understanding about the importance of vents and their locations at the top of the mold! Thank you, Robert!

This was a good video that illustrated both the material characteristics and play by play of why the little things are important. Thanks.

I need to get on your Patreon becasue, simply put, you know what the hell you are doing. Love this channel.

Great video, really eye opening to actually see the importance of the vents

Never thought about putting the hardener in first. I always did part A then part B and the hardener is always B. I will try that next time. Thanks!

Pretty amazing how we get to see it go down the silicon and cure 👍

Hi Robert, thanks for making these! It seems like larger vents means more post processing and a loss of surface quality at the point it joins the part. Is it possible make a small hole and stretch it open with something like a funnels tip or nasal speculum during filling? If the mold snaps back to its original shape before the resin sets and becomes a tiny hole, it seems like it would reduce clean up and give you more of the original shape.

Very nice video indeed, uncle Robert.

The subject was was a bit risqué today!! lol! Great Video as always!

Robert, I'm so happy I found your channel. I've been really stressed about the final mold of a project I've been working on for many months. This mold is the most complicated and I've just felt too intimidated and confused to make it yet. I'm learning so many good little tips watching your videos. I'm also wondering though if you offer any mold making consultations. There are quite a few ways I could approach this one and I'm indecisive so some expert input would be very helpful!

Very illustrative

Just a quick point, if mixing polyester resin Dont put catalyst in first!. Especially when using barrels the accelerator settles, so when the tap opens the cobalt hits the catalyst and explodes. This is why you should always spin the barrels/ tubs.

Bob, pretty neat! I like the see through pour. Like you said, you can see how it sets up. A question that begs an answer, why couldn’t you lay the mold down with the mold opening up and pour into the opening? Best regards, Richard

FIY: you accidently put an extra 'e' in your patreon link

I would love to see you molding and casting action figure parts. Some of the parts, like a bicep, have a mushroom shaped through hole that I'm guessing would require a water soluble wax core that's insert molded. Plus that part looks like it would be a multi part mold due to the parting lines. Also some action figures have disks inside their shoulders that are trapped, not sure if this was insert molded or not. If there is anything I need to do on my part to make this happen, please let me know!

Awesome!

LOVE THIS VIDEO..!!!!

pretty nice

FYI got a typo in the Patreon URL--errant "e" in "Roberet"

I was wondering, wouldn't it be much nicer to use blades made for lino cutting for the vents? It seems that with the exacto knife you end up removing allot of rubber, which could make post processing more of an issue if you dont pay attention to the original shape... Just an amateur myself, but its what came to mind!

Would you need vents if you were to poor (in some sort of way) inside a vacuum chamber ?

I have a small vintage motorcycle part with threads that needs to be replicated - I would like to see the problem solved- I bet you could do it!

Hi Mr Tolone! With Amazon having some deals on Silicon -- are there any you would recommend? **NOTE: also posted on the community tab...if you can or want to answer there instead. :) All good!!

I haven't spent my entire career casting resin parts, but I've done my more than my fair share over the years. I'm really confused why you chose to do this part the way you did. There was no need for any channels in the mold at all. All you had to do was lay the mold down and fill it up with resin until the resin topped off. A light brushing of resin on the plexiglass and all you had to do was lay the plexi glass down and put a small weight on it. I doubt I would have even done that. Just fill the mold and leave it. The back could be sanded smooth after curing.

If I use a chunky that had accelerator used, in a new mold (that has no accelerator) will the new mold be accelerated or does the accelerator become ineffective once the original rubber cures?

The one thing I'm wondering is, why not put the pour spout in the middle? Is it less likely to get air bubbles when you fill from the side and it flows outward?

is that dangerous to use resin? i scared of polyurethane.

You can see us? Sorry, I will remember to wear pants next time.

Just a small remark. Your audio level is very low. Cheers.

I wanna scream every time I see someone pouring silicone over a model!! 🤬🤬🤬🤬