2 years ago#1
stuart
Guest

I bought a new silcone mould with fibreglass shell. When I mix the cement sand/stone, when peeling the mould I am left with a seam going all the way though the statue. Is there any way I can reduce this, I have been told when I put the mould back together, use a tube of silcone where the seam is to make the seam water tight. Is this ok to do ? I know I need a a tight seam. I dont know what I am doing wrong, any info or help would be great

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2 years ago#2
mickpearson
Guest

HI. if the tube of silicon they are talking about is the type you would buy from the do it your self stores for sealing baths or doors etc then no. you will need to buy more of the same silicon like RTVsilicon.or mould making silicon.and if you don't make your own moulds in silicon normally you could buy a small amount and make sure your mould is properly aliened when you put it back together. then fill in the seam carefully from the inside making sure you don't spill any on your detail. and support your model on a level that the silicon won't spill. and when it sets use a fine sharp stanley knife to cut a new seam following the same one. make it neat by cutting one sharp cut right through. do not saw through.i don't believe you have done anything wrong it can only be one of two things a badly cut seam that is not sharp enough. or the mould was not put back together properly.you can decide this when you put it back together with care. if its not that then use the idea i have given

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2 years ago#3
stuart
Guest

Yes I think I understand now a little better, I havent worked with silcone before and im new to this but I will have ago. Many Thanks

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2 years ago#4
red46
Gold Member
Blogs: 2
Forum: 198
Votes: 7

It might just be that your clamp is not tight enough, right along the seam. Are the seams a flat flange? if so, it might do well to use strong wood clamps to hold tightly all along the seam.
Look down inside the mold with a flashlight to see where a clamp might bring those two sides together tightly.

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2 years ago#5
GunZ McGraw
Platinum Member
Blogs: 2
Forum: 310
Votes: 8

Hi ya
Seam lines. Lov em ,hate em. That is ya got to love how much easier it is for demolding but the visual kinds sucks. Does not look too bad from here. Just try to get it aligned when putting the mold together. I little post cast work and it won't look to bad at all.

Looks like a lion mold. Strange that such a large lion mold would be made from silicone for concrete casting?

You make it or buy it?
Have a good day

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2 years ago#6
Swansea Jack
Guest

Hi , I bought the mold new, I have managed to sort it out a little bit better by clamping the case in a few more place's. My next idea is to use a silcone sealant and try rub this where the seem is and see if this works. Many Thanks for your help

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2 years ago#7
GunZ McGraw
Platinum Member
Blogs: 2
Forum: 310
Votes: 8

What about kleen klay? Cheaper and you can reuse it.
You get the mold on ebay?

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2 years ago#8
GunZ McGraw
Platinum Member
Blogs: 2
Forum: 310
Votes: 8

I make and sell a 2 part ABS plastic bird mold and use clay to reduce the seam
here is a vid I use in the ad
http://youtu.be/rLfQLSK3hrY

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2 years ago#9
Swansea Jack
Guest

I have used silcone in a tube, I will know the outcome in the week. No the mould was made up for me. Many Thanks

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2 years ago#10
mickpearson
Master
Blogs: 21
Forum: 2,860
Votes: 50

HI SWANSEA JACK. buy a little silicone repair its for sticking seams or torn silicone moulds back together then tidy it up with a little mould making silicone you don't have to spend a fortune as you only need a small amount £10.quids worth and keep the change for a pint of beer.then cut a new seem with a very sharp stanley knife the silicone in the tube is not the same type so it won't work.

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