If you search of "HydroShrink" or "HydroSpan" you should find posts on other lists about this material. Losts of auto modelers use the method to make (for example) 1/87 cars from 1/43 or even 1/18 diecast cars. The same thing can be done with regular RTV by adding naphtha (lighter fluid) to it before making the mold (to shrink the model) or soaking the finished mold in naphtha or kerosene after it is finished (to expand the mold). I've seen some posts indicating that the RTV and solvent is more controllable than the Hydro product, while the latter is presumably safer because it doesn't use flammable solvents.
I think most people make a "master" casting from the shrinking/expanding mold when it reaches the correct size, and make other, stable molds from the master for additional castings. Probably a good way to make certain models for yourself, I have some ethical issues with commercial models copied in this way. Pieter E. Roos --- On Mon, 12/5/11, ctxmf74 <[email protected]> wrote: > > --- In [email protected], > Bob Werre <bob@...> wrote: > > The product is HydraSpan 100 for expanding the mold > while > > HydraSpan 400 will shrink the mold. The company > name is > > Industrialpolymers.com. > > > > > Hi Bob, That looks like a good way to > cast an S car from an HO car. I might have to learn how to > make molds and give it a try. Hopefully someone else will do > it before I get my layout to the point that I need reefers > :>) ......DaveBranum > > > > ------------------------------------ > > Yahoo! Groups Links > > > [email protected] > > > ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/S-Scale/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/S-Scale/join (Yahoo! ID required) <*> To change settings via email: [email protected] [email protected] <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
