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Post by bmw11190 on Jun 6, 2017 17:00:25 GMT -5
I bought the Alumilite 'Super Casting Kit' from Hobby lobby. I have never done this before and have a lot of questions.
I will be using this product to make casting molds for 1:24 scaled model hoods, bodies, and parts. I am not sure how to do the mixtures of the products that I see in the application video that shows how to mold and cast a hood scoop for a model car. I want to do something like that with other hood scoops, trunks, and full body models. Can anyone tell me what the mixtures are for these products because the instructions in the box do not state and I am not a mixologist (I dont have the money to just try and see if it works or not my doing 100 different ratio's of mixing) and the video does not state what the mixing ratios were (50/50, 60/40, ect..). I am a very visual person so I like to see how it is done but understand that there are limited videos on this. If I could just get an answer on what the ratio was for the hood scoop, that should help me start out with casting and molding. I only have what is in the box plus the Spatula set. Im not sure if I need anything else. Im just trying to not spend more money because I didnt get the ratio correct in the first place.
Any and all help would be appreciated.
-Brandon.
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Post by Brian on Jun 7, 2017 7:06:19 GMT -5
....I can help...... I do the same thing w/ 1:25 car parts...if you don't have one ,you will need Gram scale since the ratios are by weight. Rubber: 10:1 ratio Lets say that your mold needs 70 Grams to make, you will need to measure out 70 Grams of base and 7 Grams of catalyst before mixing. If for some reason that is not enough rubber to make the mold, you can add more since it will bond to itself in curing.
Resin: equal parts of side "A" and "B" by weight depending on the amount of resin needed to cast.....example , you have determined that it will take 60 grams of resin for a mold.....30 grams of part "A" and 30 grams of part "B" You can not add more resin to a pour like you could with the rubber...if in doubt , go a few Grams over. |
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Post by bmw11190 on Jun 7, 2017 11:34:32 GMT -5
Brian,
Thank you! This definitely helps. Just to be clear, for the rubber, I dont need to add water or anything to get that pink color. Just the base and catalyst are all I need and it will make it into that gooey pink color and consistency?
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Post by bmw11190 on Jun 7, 2017 11:54:05 GMT -5
Brian, also just to clarify, when you say 'Lets say that your mold needs 70 grams to make', are you referring to 70 grams being the weight of the car part for 1:25 or are you saying the car part is 60 but you add 10 more to make sure the mold is solid around the part?
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Post by Brian on Jun 7, 2017 18:34:58 GMT -5
Brian, Thank you! This definitely helps. Just to be clear, for the rubber, I dont need to add water or anything to get that pink color. Just the base and catalyst are all I need and it will make it into that gooey pink color and consistency? Just base and catalyst is all you will need to mix......the color is secondary as the shades of color will vary from pour to pour , no air pockets and firmness of the mold (not flimsy) is the priority... make sure and fallow Alumilites instructions on building a mold box, once you get comfortable with that aspect of casting don't be afraid to come up with your own ideas that work....be sure and share ...allow the mold plenty of time to cure, don't get impatient. |
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Post by Brian on Jun 7, 2017 19:00:43 GMT -5
Brian, also just to clarify, when you say 'Lets say that your mold needs 70 grams to make', are you referring to 70 grams being the weight of the car part for 1:25 or are you saying the car part is 60 but you add 10 more to make sure the mold is solid around the part? Once you have built a mold box for your part, or parts if you are doing a gang mold, you will need to figure out how much rubber to pour into the mold box....it has nothing to do with the weight of the car part. All of your pours will start out as a one part mold...some parts you will be able to cast w/ a one part (bell housings and batteries as an example) others will end up being a two part....suspension, disk brake/rotor combos as examples. The 70 Grams refers to how much rubber that will need to be mixed and poured into the mold box for either a one part or the first part of a two part mold. Your mold box will need to be 1/4" to 1/2" larger than the piece you are making a mold of......if its a one part mold the rubber needs to be 1/4" over the highest point on the piece you are making a mold of....same applies to a 2 part...keep in mind that with the 2 part mold, the first poured piece will become the bottom half of the mold so you will already have the 1/4" of rubber on the bottom since it will have to be turned over for the 2nd pour. Again, I repeat myself, you can add RTV Silicone (rubber) as much as you want since it will bond with its self......I have repaired/modified a couple of molds doing this....the molds were at least a year and a half old when I did this.....so if you don't pour enough rubber the first time , no problem 
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Post by carol - Alumilite Corp on Jun 8, 2017 14:28:03 GMT -5
Brandon,
I see you are all taken care of with some excellent advice and knowledge. You have been given very accurate mixing ratios with our products and an excellent description of what you need to do to make your project a success. Thank you Brian! The only thing left for me to add is... please feel free to call here if there is anything you aren't clear on.
Have a wonderful day!
Regards,
Carol
800-447-9344
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Post by mike on Jun 9, 2017 7:47:38 GMT -5
One other quick piece to add ... there are also volume instructions along with the cups and a little scoop that are included in the kit to mix the silicone by volume IF you do not have a scale.
As Carol mentioned, any questions ... don't hesitate to call.
And great advice/responses Brian!
Mike
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