So a friend and I are working on projects at the moment that will soon require molding and casting (Polyurethane), he a Power Ranger Helmet and I a shoulder piece. Silicone is obviously the way to go and rebound 25 seems to be the most popular, especially for helmets and headgear. First question is what makes rebound 25 the best silicone for this. We're both noobs! So obviously it's marketed as a brush on silicone which is what we're looking for, but what separates it from Rebound 40? The only apparent thing is 'Elongation at Break' which I'm guessing means it's less likely to break when de-molding, but to have that clarified would be awesome.
Next question is what other silicone products would work? We don't have access to a vacuum chamber, so anything that requires that is out. I checked Smooth-ons list of international distributors for suppliers in Ireland (thats where we are) and came across only one. They have a great selection of smooth-cast polyurethanes, but for silicone they have everything BUT Rebound. The other issue is it costs far more over here than in the US, so if other products would do just as good a job they could save us some serious cash! The other brand the Irish supplier has is Moldsil. Anyone have any though, tips or reviews on that?
Finally a call out to the other Europeans here. Do you know of a reasonable supplier, again I went through Smooth-ons list looking for any country in the EU and they either only had the small containers or the gallon containers cost insane amounts of cash! (Also you guys seem to measure it in KGs, not gallons, how many KGs of silicone in a gallon )
Side question: Would one of the small kits smooth-on sell (I believe it's about a pint) be enough for say a helmet?
Tl;Dr Need bush on Silicone like Rebound 25, but available in Ireland/Cheaper
P.S I have been searching around here for people with similar problems, and found some helpful posts but I would like some specific answers to be sure