i bought a kit that includes the rtv type stuff for the mold and 2 part resin for casting.
the part being replicated was thin, when the resin dried it remained pliable, more like vinal.
sooo i bought a different brand off ebay, the name is model pro, and lo and behold it does the same thing. i did notice the remaining resin i didnt use dried hard.
so question is, how do manufactuers get the small parts to dry hard so they can be sanded etc?
?
Hosted by Darren Baker
casting resin
truelove
Joined: October 14, 2015
KitMaker: 77 posts
Armorama: 76 posts
Posted: Tuesday, November 17, 2015 - 12:01 AM UTC
HeavyArty
Joined: May 16, 2002
KitMaker: 17,694 posts
Armorama: 13,742 posts
Posted: Tuesday, November 17, 2015 - 12:09 AM UTC
Sounds like either the resin is old, or you are not mixing to the right ratios. Either will result in a soft resin part.
truelove
Joined: October 14, 2015
KitMaker: 77 posts
Armorama: 76 posts
Posted: Tuesday, November 17, 2015 - 12:28 AM UTC
the company claims its fresh..its simple 1:1 mix. i bumped up the hardener about 50% and the results were brittle like a cracker. so backed off some but still is to pliable. maybe just more experimenting.
actually i was hoping there was a particular brand ppl used that had good results.
actually i was hoping there was a particular brand ppl used that had good results.
HeavyArty
Joined: May 16, 2002
KitMaker: 17,694 posts
Armorama: 13,742 posts
Posted: Tuesday, November 17, 2015 - 12:36 AM UTC
C_JACQUEMONT
Joined: October 09, 2004
KitMaker: 2,433 posts
Armorama: 2,325 posts
Posted: Tuesday, November 17, 2015 - 03:08 AM UTC
Gino,
What are you using exactly? Thinking of casting my first resin...
Cheers,
Christophe
jasmils
Joined: December 23, 2003
KitMaker: 1,016 posts
Armorama: 745 posts
Posted: Tuesday, November 17, 2015 - 04:00 AM UTC
1:1 mix is by weight, not volume. Make sure you are using a good set of scales , as even 5% either way can cause problems.
Christopher, this might help. This is a cast work shop I did for my local quite a fews years ago now. Just change the "rubber bands" for sticky tape.
My drop pouring resin workshop
Smooth-On is pretty much exactly the same product as I use.
Christopher, this might help. This is a cast work shop I did for my local quite a fews years ago now. Just change the "rubber bands" for sticky tape.
My drop pouring resin workshop
Smooth-On is pretty much exactly the same product as I use.
C_JACQUEMONT
Joined: October 09, 2004
KitMaker: 2,433 posts
Armorama: 2,325 posts
Posted: Tuesday, November 17, 2015 - 04:15 AM UTC
Thank you Jason! 
Cheers,
Christophe
Cheers,
Christophe
Biggles2
Joined: January 01, 2004
KitMaker: 7,600 posts
Armorama: 6,110 posts
Posted: Tuesday, November 17, 2015 - 04:56 AM UTC
I've used Alum-a-lite several times. Works good for me. 
truelove
Joined: October 14, 2015
KitMaker: 77 posts
Armorama: 76 posts
Posted: Tuesday, November 17, 2015 - 05:19 AM UTC
Quoted Text
I've used Alum-a-lite several times. Works good for me.
Alumi lite was the original kit i had.
The model pro set up hard in larger pours..but the small poeces are vinyl-y.
Thanks for the info i'll check out the workshop vid.
amoz02t
#192
Joined: November 25, 2009
KitMaker: 1,383 posts
Armorama: 1,281 posts
Posted: Tuesday, November 17, 2015 - 08:21 AM UTC
Milliput putty? Like Superfine White Milliput in only part of the mold?
DocEvan
Joined: August 09, 2014
KitMaker: 180 posts
Armorama: 180 posts
Posted: Tuesday, November 17, 2015 - 09:55 AM UTC
I've had good luck with this product as well as Micro-Mark's brand of casting resin.
Avoid Amazing brand resin, which is sold by Ben Franklin Crafts.
Avoid Amazing brand resin, which is sold by Ben Franklin Crafts.
Quoted Text
I've used Alum-a-lite several times. Works good for me.
adamant
Joined: March 25, 2009
KitMaker: 152 posts
Armorama: 119 posts
Posted: Tuesday, November 17, 2015 - 10:27 AM UTC
It may pay to try a heat source like a hairdrier with thin parts, but you will have to be careful the item doesn't harden out of form.
jasmils
Joined: December 23, 2003
KitMaker: 1,016 posts
Armorama: 745 posts
Posted: Tuesday, November 17, 2015 - 12:37 PM UTC
How thin a part are we talking here?
truelove
Joined: October 14, 2015
KitMaker: 77 posts
Armorama: 76 posts
Posted: Tuesday, November 17, 2015 - 04:02 PM UTC
The part is about .040
The hanger im working in is getting cool now temp wise and had thought about throwing some heat on it.
The hanger im working in is getting cool now temp wise and had thought about throwing some heat on it.
1.90E_31
Joined: December 24, 2004
KitMaker: 252 posts
Armorama: 154 posts
Posted: Tuesday, November 17, 2015 - 04:42 PM UTC
Hi John,
Parts that are this, such as your .040" piece, will be pliable for awhile until the resin fully cures, which could be 3-5 days depending on the type of resin used. The reason why is that the part itself doesn't have a lot or resin volume, and therefore doesn't generate a lot of heat during the initial cure process. You could try mixing a batch that's far too much, which will get you a better mix ratio of parts, and just discard the rest.
I can tell you that even with a large batch, the part will remain pliable for up to 24 hours. One of our ship kits has a .040" think flight deck that when cast, has to be cut from the sprue, and allowed to cure flat overnight. What you're seeing is not unusual.
Jon
Parts that are this, such as your .040" piece, will be pliable for awhile until the resin fully cures, which could be 3-5 days depending on the type of resin used. The reason why is that the part itself doesn't have a lot or resin volume, and therefore doesn't generate a lot of heat during the initial cure process. You could try mixing a batch that's far too much, which will get you a better mix ratio of parts, and just discard the rest.
I can tell you that even with a large batch, the part will remain pliable for up to 24 hours. One of our ship kits has a .040" think flight deck that when cast, has to be cut from the sprue, and allowed to cure flat overnight. What you're seeing is not unusual.
Jon
truelove
Joined: October 14, 2015
KitMaker: 77 posts
Armorama: 76 posts
Posted: Tuesday, November 17, 2015 - 06:49 PM UTC
Quoted Text
Hi John,
Parts that are this, such as your .040" piece, will be pliable for awhile until the resin fully cures, which could be 3-5 days depending on the type of resin used. The reason why is that the part itself doesn't have a lot or resin volume, and therefore doesn't generate a lot of heat during the initial cure process. You could try mixing a batch that's far too much, which will get you a better mix ratio of parts, and just discard the rest.
I can tell you that even with a large batch, the part will remain pliable for up to 24 hours. One of our ship kits has a .040" think flight deck that when cast, has to be cut from the sprue, and allowed to cure flat overnight. What you're seeing is not unusual.
Jon
Thanks for the info!
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