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Post by toeslider on Mar 24, 2016 21:43:17 GMT -5
In the process of casting a part I managed to tear off a small portion of a High Strength 2 mold. Is it possible to reattach it, and if so, how?
thanks!
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Post by Brian on Mar 24, 2016 22:36:04 GMT -5
..... I didn't tear a piece off rather I purposely cut out a portion (design change on the master) and simply re poured the section that I had cut out with the updated master firmly in place. Since the rubber bonds to itself , I have a mold of the updated design with out the hassle and expen$e of creating a new mold.
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Post by carol - Alumilite Corp on Mar 25, 2016 10:13:13 GMT -5
Brian is right Toeslider. Silicone only bonds to itself, it would have to be repaired with another silicone. If it is a tin cure silicone (High Strength is) then repairs with the High Strength are best. If it is platinum cure silicone should be repaired with a platinum cure silicone. Tin systems are not as touchy with inhibition issues as platinum cure systems, so the statement below would not apply for platinum silicones.
I have had people tell me they have done small repairs by using silicone caulks again on tin cure silicones), nothing I have tried!!
Have a great weekend Brian and Toeslider.
Carol
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Post by toeslider on Mar 25, 2016 18:08:34 GMT -5
I was hoping for some sort of super glue-like bonding agent, as the piece is long, thin and fits perfectly. I'd rather not get another HS2 set as it is rather pricy to just use a tiny bit, but if that is the only solution that will work I guess I will keep it in mind.
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Post by Brian on Mar 25, 2016 23:28:25 GMT -5
I have not yet had to repair any HS 2 or HS 3 molds , but a few years ago I did repair a mold that was made with what ever rubber Micro Mark was selling. I used the Black Permatex RTV silicone...available at your favorite auto parts store ..its still bonding today although I haven't poured any resin in it in a few years. Where I made the repairs, it left a small line in the resin cast that was easily taken cared of with a sanding stick.
I might have to try and experiment with some small scrap pieces of HS 2 or HS 3 that I have laying around and see if the Permatex RTV silicone will work or not....
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Post by Brian on Apr 2, 2016 19:21:00 GMT -5
...spoke with Bob Hayse today on what he does to repair HS-2 molds........he simply mixes up a very small batch of HS-2 and applies it to the area that was damaged and reattaches the piece.......since the rubber will bond to itself it is a permanent fix...I will do this method in the future, should the need arise, verses the RTV silicone as I previously stated...both work, but you will get a cleaner repair with using the rubber you used to make the mold in the first place.
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Post by carol - Alumilite Corp on Apr 12, 2016 9:33:38 GMT -5
My Friend Bob,
You need to get back in the forum you are a valuable asset! Yes Brian you do get a cleaner repair by using a like silicone.
Regards,
Carol
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Post by Brian on Apr 16, 2016 22:31:01 GMT -5
My Friend Bob, You need to get back in the forum you are a valuable asset! Yes Brian you do get a cleaner repair by using a like silicone. Regards, Carol ....Went by Bob's today...relayed your message...claims he forgot his password or user name....told him he might have to start over with a new name and pass word if his old one cant be located. |
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Post by carol - Alumilite Corp on Apr 19, 2016 6:59:47 GMT -5
Thank you Brian, how was he feeling? We can look that up for him, or he can start over!
Have a great day Brian.
Carol
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