Hi, just wondering, if too much catalyst is added, will the end product develop hairline fractures due to the speed that the resin sets?
 May seem an odd question but it is serious. It is required for an artistic purpose. Many thanks.

Possibly, depending on how much more catalyst is added. I'd be more worried about distortion and discolouration from shrinkage and heat build up. 

Thanks for the reply. Discolouration what form, cloudiness or a complete colour change?

Generally cloudiness and a bit of yellowing. The degree of yellowing again depends on how much catalyst was used. 

best thing for me to do is do some tests. Many thanks for your interest.