(04-01-2010, 11:31 PM)427 Cobra Wrote: Sorry, I'm not very familiar with this line of products, but I'll be using them soon enough. It doesn't matter much, I'll be using both products listed in each post. I just hope I don't ruin my master in the process!
Well, I look at it this way...if you're carefull to make the mold correctly...you no longer need the master
Among all the products listed...I'd actually reccomend going with the Shell-Shock as the jacket material....it's much more rigid...much sooner.
The Plasti-Paste can deform some if you try to push the cure time.
It's fine if you can leave it alone in a 70 deg. temp. for 2 days...then it's real solid.
The Mold max 30 with the fast cat. worked real well...I could lay up the entire silicone portion in only a day.....gotta work pretty fast though...
you might want to go with the standard catlyst if you're a newbie.....might take longer...but you can take your time and still get a good mold.
On thing I didn't mention....
On the bottom portion of the mold...I decided to add keys to the silicone.
The bottom of the hull is kinda flat panel(ish) so I was concerned about getting the silicone to sit in the proper location on the jacket.
To solve this issue, I cut some strips from an old mold so I could make blocks... 1/4" x 3/16" x 1" ( or so )...then, while the last coat of silicone was still "wet", I placed the blocks in a random pattern all over the surface.
Then, when I applied the jacket material, I made sure there were no air pockets around these blocks.....when everything cured up, I pulled the jacket off and Ta-Da! locators ! Now the silicone skin "snaps" right in to it's proper location.
The top half of the mold was, in effect, a deep bowl....so this step was not required.
Whew.....class over