nice mold making video. Using fiberglass is nice. Like the polishing. Thanks for the post

I've never thought to use fiberglass instead of burlap. I'm going to have to try that for my next stone mold.

@Tomcreature Ultracal 30 has very different working properties and is much heavier than Hydrocal. For this type of support mold we need something strong but we also need something relatively light. Hydrocal allows for a fast cure as well as a gradual thickening that aids in this type of mold process.

@KewneRain That's why we add the fiberglass matte!

If you are using burlap cut into squares they should overlap each other half way giving you a total thickness of 2 layers of burlap.

Ok I'll go buy some Hydrocal then. Thanks for the reply.

can anyone explain what flashing is? I understand it to be sculpting a channel against the sculpture so when it's molded there's a way for excess material to leave the mold to allow the mold to close properly. is this correct?

Hydrostone is a stone so the application and mixing process is different. The main difference, relative to this process, is that Hydrostone is designed for casting and set quick with little warning. Hydrostone does not have the gradual set of Hydrocal.

@Minifisen Yes.

I think I have some hydrostone, could I use it instead of hydrocal? And whats the difference between these two plasters?

How long should the silicone mold cure prior to applying the plaster for the mother-mold shell?

The downside to using petroleum Jelly for this process is that it does not dry. Paste wax dries. Paste wax is also right about the same cost so it just means walking to a different isle in the grocery store.

I didn't see fiberglass mats/mattes(?) on your site. What brand and weight per square foot do you use and where do you buy yours?

About how many reinforcement layers should you have using burlap fabric, cut into strips?

ok thank you

I'm using 70-30. Same?

How big is that bag of Hydrocal?

I used fiberglass matte that I found at a local hardware store.

For 71-20 I wait ~4hrs after I apply the final coat.

70-30 cures in ~16 hours. That's when you can start the mother mold.

@omex2005 My condolences...

Do you think you could spend a video briefly going over the most important tools and their applications?

@Lurker1979 That is a 100# bag.

Nope. Flashing is the casting material that seeps into the seam of the mold. The better the seal on the mold the less flashing there will be on the cast part.

...in your future videos that is. :)

Please increase the volume of the sound. :)

I couldn't find fiberglass mats/mattes(?) on your site. What brand and weight per square foot do you use and where do you buy yours?

I USED THE SINK :/

New Mic? :o

@Fuzzy192006 I made a deal with the empire that will keep cloud city safe for a long time.

@brickintheyard Wow, cool. :)

I don't recommend it. Much harder for Hydrocal to penetrate the cloth.

crap...