a good tut on how to make a cheap mold from caulk

[rvb18]

hope it helps

 

[whiteninja1990]

thanks for the info
i smell a sticky

 

[rvb18]

update! this method works! just be sure to have a release agent on the part before molding

 

[cfh935]

update! this method works! just be sure to have a release agent on the part before molding

What did you use for a releasing agent on yours?

 

[mchammertime]

This tut seems verrrry sticky, if you know what I mean...
I really like it! How does it hold up to resins?

 

[TH3 FETT MAN]

That was a good tut, ill have to try it some time.
Sticky

 

[cgspartan]

just gonna copy/paste a point i made about this same topic in another thread rather than rewriting it.

Most tin cure silicons and urethane rubbers are on average 80-100 from smoothon for a gallon kit (that's 1 gallon of partA + 1 gallon of partB = 2 gallons total)



most silicon caulking is roughly 3-5 dollars per tube. And are 10-12 ounces in a tube, meaning that it takes up to 10-13 tubes to make a single gallon.

And 20-26 to make the same amount as a gallon kit of a 1:1 mix silicon or urethane from smooth-on.


What am I getting at here?

That silicon caulking can be anywhere from 75 to 130 dollars for 2 gallons, or you can spend the exact same amount or less on a urethane rubber or tin silicon from smooth-on and get a MUCH higher quality end product.

 

[rvb18]

ya if you are dumb enough to spend that much on caulk. i spend $2.50 a tube from wal mart and that knee only took half a tube but i used the whole thing for extra strength. and that smooth-on rubber is not only expensive but if you screw up then you're out allot more money then with the caulk. 1 gallon of rebound cost $175

as for the caulk. I've made 2 cast and both released well and the mold will probably last as long or longer then rebound. and i use petroleum jelly as a release agent

 

[Cirkob5477]

So, you put Vaseline on the object to mold before putting the caulk on it?
I mean, I don't understand how the caulk would stick on the mold

And this should definitely be stickied

 

[rvb18]

put a thin coat of petroleum jelly or Vaseline on the object so it's easier to remove from the mold. i do the same to the mold before i cast so it's easier to pull and if you do this your mold will last longer

 

[Cirkob5477]

Aaaaaaaah okay, thanks for clearing that up

 

[beaker]

good article on using silicone caulk from a well recognized resource...
http://books.google.com/books?id=naUbS2Hng5EC&pg=PA161&lpg=PA161&dq=silicone+caulk+for+mold+making&source=bl&ots=92XqG9pb9V&sig=Hwg6vjeOYmPh89h2CdWEckWWWXE&hl=en&ei=z8NATLzYGc-MnQeUm9SpDw&sa=X&oi=book_result&ct=result&resnum=4&ved=0CDQQ6AEwAzgK#v=onepage&q=silicone%20caulk%20for%20mold%20making&f=false

 

[rvb18]

thanks for the article. the more tuts we have on this, the more people can find out and learn on their own!

 

[deactivyoke]

Dude i love you also do you think that would work for wodden knives?

 

[this is haji]

Id be careful, make sure you coat the wood with a sealer first

 

[deactivyoke]

*In Tech Support Accent* Ah thank you haji i will be sure to do that.

 

[Kirrou]

Hey man thanks for the post this is a great tut and would be something fun and cheap to experiment with.

 

[rvb18]

ya, seal it with polyurethane or some fiber glass resin. then you can mold it. still use some release agent. it really helps!

 

[bobbio555]

Would any changes be necessary to use fiberglass with this? I.e to reinforce the mold? And what could you use to make casts with, instead of plaster?

 

[rvb18]

what i did is replace all the plaster with fiberglass. the jacket, the casting material, all the plaster is now fiber glass. and it works well. I've made 2 casts for myself and i just finish molding the shoulder and will put the jacket on it later.

BTW that means both knee casts are ready, and soon shoulder casts will be up for sell