RTV Silicone Mould Making Rubber 260g Kit: 250g Silicone + 10g Catalyst - Shore Hardness A28
Is this what I need for test moulding ? Like brick walls and the like .
Paul
That sounds very similar to the stuff that I have sitting out in one of the barns Paul.....Though I haven't tried to RTV anything for years now.
Not sure what you'd need in the way of Shore Hardness 'rating' for walls and the like.....I've only ever used Silicone Rubber, in the past, to copy fairly small items.....and I've now been put onto "Instant Mold" for that sort of work form the forum.
I M is much quicker and far less messy for that type of stuff.....and you can use it over and over again.
Hopefully someone with more experience in RTVing will give you some help.
Cheers - Phil
Hi Phil,
I see, but in your opinion would it do for a small building ? See Iam just seeing if I can do it successfully , was thinking about solid walls , not the ones I do before and like bunkers of pallisades that kind of thing .
Paul.
I'm not sure on the Shore ratings either, but any silicon rubber should be OK for making a test piece.
It's on it's way , cost under a tenner so if it doesn't work then no great loss.
Thanks lads.
It should be fine. I've done a fair bit with RTV so holler if you need any help.
Cheers,
Craig
Good !
I was hoping you'd jump in Craig ! ;) :)
Cheers - Phil.
Thanks Craig , might just do that. ;)
Paul.
I did a lot of RTV casting back in the eighties, Chalkie, although metal figures. You don't say exactly what you intend to mould - metal or resin. Assuming the latter you will presumably need some kind of release agent, one to get the master out of the mould and possibly another to get the moulded article out. With metal I used vaseline disolved in white spirit for the moulding and graphite or talcum powder for the casting. Whether either would work with resin I don't know.
You will also find Lego bricks and plasticene useful for containing the mould while it sets. Flatten out the modelling clay and build a box of Lego bricks on top. Sit the master in the middle and then pour the rubber compound over it (not forgetting the release agent, of course). I always allowed twenty-four hours for curing before attempting to extract the master. You should then have a useable mould.
Good luck.
Ray
Quote from: Hertsblue on 29 August 2013, 08:28:09 AM
I did a lot of RTV casting back in the eighties,
Wow! You were on Irish telly?
Quote from: fsn on 29 August 2013, 10:53:00 AM
Wow! You were on Irish telly?
No. just finding actors for Ros a Run and the Riordan's
Hertsblue, I was going to try casting plaster, is that ok for walls etc ? Thought of the releasing agents , same as what you have mentioned actually. I will keep you posted on how I get on.
Cheers,
Paul.
Quote from: chalkie on 29 August 2013, 09:54:50 PM
I was going to try casting plaster, is that ok for walls etc ?
Don't see why not...God luck Paul..Look forward to seeing the results.
Cheers - Phil
Quote from: fsn on 29 August 2013, 10:53:00 AM
Wow! You were on Irish telly?
Quote from: Fenton on 29 August 2013, 10:57:12 AM
No. just finding actors for Ros a Run and the Riordan's
Sorry, guys, that went straight over my head. :P
Chalkie, the stuff you want to be using is called Herculite 2, not that cheap but way more durable than Plaster of Paris. And if all you want to do is cast plaster you might want to give a thought to making your moulds from latex.
Hi Gordan, I've ordered some hurculite. See I don't know what resin to use, maybe you know ?
Cheers Paul. :)
if its walls etc you dont need to be using resin (nasty smelly stuff) just cast them in herculite, much nicer to use, 2 volumes of powder to 1 of water, pour it in the mould and pop it out again in an hour, leave for 24 hours and start painting. Once this stuff is fully dry you really have to work hard to damage it. For easy and cheap mould making try watching this http://www.youtube.com/watch?v=zPNV1ArY59s
Thanks mate will do. :)