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i`ve been using some T20 silicone rubber to do a rather large mould, but i don`t think i`ve used enough catalyst, it`s been 24 hours, it has cured only slightly, i just want to know if i leave it long enough will it cure?
 

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Sounds like not enough catalyst to me. Eventually it will cure, it may take up to a week but eventually it will. Once the mold is stiff to a finger pressed in it you should be ok. You should be able to tell the difference between an uncured mold and a cured mold by pressing your finger in it. the stiffer it is the better.

I have also heard that some peoples molds never cure with a lack of catalyst. Personally my have all cured eventually. If yours doesn't by a week then it may be trashed.
 

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locknar, youve been lucky. and it does vary from brand to brand. as a rule of thunb i always use 12% rather than the reccomended 10.

some people may tell you to heat it to cause it to set faster... DONT DO THAT! ive had some very funky things happen when ive tried that.
 
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