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Stroke vs Rebound

 
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jason.sgtski
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Joined: 17 Jan 2011
Posts: 16

PostPosted: Fri Aug 05, 2011 1:55 pm    Post subject: Stroke vs Rebound Reply with quote

Smooth on mold max Stroke vs rebound 25. the cost is in favor of stroke. The plan is to make a mold of a GB Proton Pack and then use a fiberglass mothermold. What does your experience say are the pros and cons for the cost savings.
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Fredo
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Joined: 21 Mar 2007
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Location: Kingdom of Nye Area 51

PostPosted: Sat Aug 06, 2011 11:21 am    Post subject: Reply with quote

I assume both these products come from http://www.smooth-on.com/ , though I couldn't find them on the tech. data sheets. If so, give them a call. You'll pay for the phone call... That's why I use www.alumilite.com , their help line is an 800#.
Fiberglass will work for a tool if it's not allowed to get too hot. Polyester resin doesn't handle heat very well, and it'll need to be thick enough to handle the load. Fiberglass molds are not production molds.... I'm sure they'll work for short runs if allowed to cool between cycles. That's about all I've got..............Fredo
p.s. Cheap molds don't live very long.
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jdougn
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Location: Louisville KY area

PostPosted: Sat Aug 06, 2011 1:55 pm    Post subject: Reply with quote

What do you plan on using for the final mold? Also, are you going to vac form the final product? If you're vac forming then Fredo has good advice on using higher quality products designed for the heat & pressure.
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jason.sgtski
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Joined: 17 Jan 2011
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PostPosted: Sat Aug 06, 2011 2:58 pm    Post subject: Reply with quote

The plan is to make a master from sintra and bondo and then use the smooth on rebound- http://www.smooth-on.com/Silicone-Rubber-an/c2_1115_1132/index.html or stroke- http://www.smooth-on.com/Silicone-Rubber-an/c2_1113_1135/index.html.

Once the mold is made we will make a 2 part fiberglass mother mold for strength.

We will make copies using gelcoat then fiberglass and resin.
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jdougn
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Joined: 18 Mar 2009
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Location: Louisville KY area

PostPosted: Wed Aug 10, 2011 2:31 pm    Post subject: Reply with quote

jason.sgtski wrote:
The plan is to make a master from sintra and bondo and then use the smooth on rebound- http://www.smooth-on.com/Silicone-Rubber-an/c2_1115_1132/index.html or stroke- http://www.smooth-on.com/Silicone-Rubber-an/c2_1113_1135/index.html.

Once the mold is made we will make a 2 part fiberglass mother mold for strength.

We will make copies using gelcoat then fiberglass and resin.


So the final product is laid up fiberglass and not vac forming. You won't have to worry about heat and pressure since it's not being vac formed.
Hopefully the guys with more fiberglass experience will chime in.
dn
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jason.sgtski
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Joined: 17 Jan 2011
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PostPosted: Wed Aug 10, 2011 5:51 pm    Post subject: Reply with quote

I am just concerned with the 2 types of brush on silicone. one is 10-1 and the other is 1:1. cost is significantly different and i want to know if the results are the same.
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Fredo
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Joined: 21 Mar 2007
Posts: 251
Location: Kingdom of Nye Area 51

PostPosted: Wed Aug 10, 2011 7:38 pm    Post subject: Reply with quote

The difference is that one of them needs an additive for vertical application. http://www.smooth-on.com/tb/files/Mold_Max_Series_TB.pdf ........Fredo
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