this tutorial taught me a lot thanks. i've been coming along with my resin casting but i still have a few questions.
1) is there a time limit to multishot casting? i was under the impression that after the cure time expires the resin won't stick to new shots of resin. have you had any problems with that?
2) are u degassing the resin when multishooting for the initial shots and then pressure chambering the final shot?
3) most of my casts are smooth, but sometimes a fingerprint shows up and i always have to remove sprue connections. do u ever sand/polish resin? if so what is the technique and materials used?
1. Yes, you want to to cast the second shot before the first one has finished curing (but still hardened enough not to flow into the second one). This varies from resin to resin, so the best option would just be to try! You do not need to be super exact with it though, just make sure it does not sit for many hours.
2. No, I only pressure the last shot. The resin I use have very good abilities to let air out when not enclosed. The most important part when pressurizing is after putting the backside of the mold on.
3. Haven't experienced that myself except with one transparent resin I tried. The issue with that one was that it was not made to handle walls as thin as the keycap, which caused the cap to cure much slower than I'd like. I'd say look into getting another resin and not going for polishing every cap!
It's the best tutorial for me.
I used to make caps for several months and your tutorial makes me know something that I didn't (the marble part).
I have some questions, can you please help me to answer:
1. Multishotting tutorial: we add the different color by layer right? this means you do 1st the layer for the eyes, then 2nd for teeth, 3rd for leather strap,... right? Because based on the image in your instruction, it looks like you put all the clear resin into the mod, then use the toothpick to fill the layer.
2. Multishotting tutorial: Do we need to wait until complete cured (hard) before adding another layer?
3. Marbleing tutorial: just have the question about the colors. As I see in the image, 2 part are transparent color, then you add a drop of opaque color and mix right?
4. Marbleing tutorial: And what kind of color should I use, i used to test with transparent color and it has no problem. but when I used the acrylic color or pigment I have the problem that the color is not solvent 100% to the resin. Can I have your advise here
5. The resin i made usually not hard, it still a bit soft. about 70 - 80%. I don't know the problem coming from: I try to change the mixing ratio from 3A: 1B to 2A: 1B and it not resolve the problem. I also try to mix a cup of resin, then I use apart to make key cap, another to coat on the small wood. the cast on wood is hard 100% but the keycap is still 70- 80% hard (although it comming from the same mixed resin). If you have an experience on this problem, can you advise me?
1. I do not quite understand the question here. Yes, they're added layer by layer. Not sure what you mean by the transparent resin!
2. No, more the oposite, see the (1.) answer above!
3. No, the opposite here as well. I mix the resin completelly with a opaque colorant, then I add one drop of transparent colorant. As my trans colorants are so concentrated, it makes for a good and smooth marble effect.
4. Hmm, my only advice here would be to add it in smaller ammounts to a few different places in the mixing cup, instead of one big in one place.
5. Sounds like the same problem as the above commenter. Look into your resin properties and see what it says; gettin another resin is the only advice I can give you!
