RipLip Posted June 19, 2008 Report Share Posted June 19, 2008 Is $34.00 for 15oz. of RTV silicone steep or am I just cheap? I was expecting more but when I recieved the bottle I was dissapointed. On other threads people are very happy with oomo and the 10lbs it comes in. How much is 10 LBs. 15oz doesn't go very far for the price. Thanks Quote Link to comment Share on other sites More sharing options...
Vodkaman Posted June 19, 2008 Report Share Posted June 19, 2008 (edited) RTV is expensive, but that is only enough to make one 2 part mold. Do you mean one pint of each of the two part mix. If so, that is a bit better. I buy mine at a local craft shop. Handy but expensive, as all craft stores are. It was US$153.75 for 19lbs total, that works out at US$8.09 per pint. Usually when you buy small quantities, you pay a premium price, but that does sound excessive. I suggest you search TU, collect all the company names that do the stuff, go get the prices off the web sites and compare. Edited June 19, 2008 by Vodkaman Quote Link to comment Share on other sites More sharing options...
RipLip Posted June 19, 2008 Author Report Share Posted June 19, 2008 I'm not sure how many ounces a pint is but this is 15oz with a smaller bottle of the additive. Thanks for the info I will look around for better pricing. As usual bulk is the way to go but that adds up with RTV. Quote Link to comment Share on other sites More sharing options...
Vodkaman Posted June 19, 2008 Report Share Posted June 19, 2008 The money bit stings, but careful trying to skimp on the RTV pour. I have been there, the wall thickness got too thin and distorted the castings. If you mess up, don't throw them away. Do a search through Husky's posts. He cuts up old molds and puts them in the mix to make up the volume. Quote Link to comment Share on other sites More sharing options...
RipLip Posted June 19, 2008 Author Report Share Posted June 19, 2008 Thanks for the advice. I was going to use this a little thin but now I'm not going too. I'll try and dig through the threads and find Huskys thread. Thanks again Quote Link to comment Share on other sites More sharing options...
Smallie Posted June 19, 2008 Report Share Posted June 19, 2008 OOMOO 25 is my favorite. It has a shelf life so don't buy the gallon and expect to use it forever. I don't know how long it lasts but they could tell you. I buy the trial size. Quote Link to comment Share on other sites More sharing options...
Smallie Posted June 19, 2008 Report Share Posted June 19, 2008 Not only can you cut up old molds but you can pull the skin out of the mizing container and cut it up. I pour fresh RTV over the masters to give them a smooth coat, then sprinkle in the cut up stuff then pour more fresh stuff over it to give you a smooth bottom that is square to the top. Quote Link to comment Share on other sites More sharing options...
RipLip Posted June 19, 2008 Author Report Share Posted June 19, 2008 I'm going to try the OOMOO 25. Thanks Smallie Quote Link to comment Share on other sites More sharing options...
gunnie3035 Posted June 19, 2008 Report Share Posted June 19, 2008 I would personally go with the 30. I believe it is the same thing as the 25, but it doesn't set up as fast. The 25 will begin to thicken after 4-5 minutes, the 30 will buy you a little more pouring time. Quote Link to comment Share on other sites More sharing options...
redg8r Posted June 19, 2008 Report Share Posted June 19, 2008 Just a couple quick notes, Pay attention to the stated amounts from various suppliers. Some sell a gallon that is actually 2 gallons (1 gal A & 1 gal Some sell a gallon with half gallon A & half gallon B. & thats only the 1:1 products, others like 10:1 etc. are easier to price. Also, the comments on recycling leftover (cured) silicone, great tip, but make sure the "shore hardness" is similar, I have used harder shore silicones as fillers in softer shore molds & over time the mold will distort out of shape. Or if you have the time & patience, consider using plaster backers to conserve material. RTV isn't cheap but it's a fantastic medium you'll be using for alot of different projects (if you're like me) My Good luck! Quote Link to comment Share on other sites More sharing options...
MDC Posted June 19, 2008 Report Share Posted June 19, 2008 Or if you have the time & patience, consider using plaster backers to conserve material. Good tip and it works well. Just pour enough to coat the masters let it cure then fill with POP. Quote Link to comment Share on other sites More sharing options...
redg8r Posted June 20, 2008 Report Share Posted June 20, 2008 Or if you have the time & patience, consider using plaster backers to conserve material.Good tip and it works well. Just pour enough to coat the masters let it cure then fill with POP. Yup, alot of pro moldmakers add keyways & other registration marks to keep the plaster & RTV seated well. I've added poly batting (polyester fuzz) onto the back of the uncured RTV, then when you pour your plaster backer it absorbs the remaining exposed poly batting to lock the 2 together. The only downside is that the silicone will lose its oils quicker since its walls are thinner. The oils in a thick RTV mold will migrate towards the cavities as oils are lost there over time. making it last longer. Quote Link to comment Share on other sites More sharing options...
