Yes
 

On the right track, it should be a NO sulpher, especially if using a polyaddition/platinum cured silicone. It will definitely cause cure inhibition and you will havea sticky freaking mess, and nothing will solvate unreacted silicone. Isopropyl alchohol will help with wiping up the mess but you will have to use many cloths, papertowels, wipe once discard, repeat, repeat, repeat. if you do not you will just transfer to many other places and you will not get rid of it. if it ever ends up on a surface to be painted or gelcoated, you will have an adhesion issue.

Klean Klay is a commonly used clay which contains no sulpher.

No temp rating on the box. As mentioned previously it's a non hardening clay. I get it from Composites One.

strick

Thanks guys ... Appreciate the advice.. Starting the decks this week..