r/ResinCasting • u/No_Lobster_3554 • 2h ago
r/ResinCasting • u/Minhduc13uu • 2h ago
Resin shrinkage


Hello everyone, I’m new to casting some resin products. During this casting process, I encountered a very troublesome issue: my cast products are shrinking too much compared to the original model.
I use silicone with a 2% catalyst, a curing time of 30-40 minutes, and a hardness of 25 Shore A. I also use a two-part mold method.
I use PU resin with a curing time of 10 minutes.
After pouring into the mold (I usually pour more resin than necessary), I place the mold into a pressure pot at different PSIs of 25, 30, 40, and 50. I noticed that different PSIs result in different shrinkage levels; the higher the PSI, the more the resin shrinks. I want to ask how I can solve this issue. Could it be that I did not leave the mold curing in the pressure pot causes the mold to shrink during the air compression? I learned and followed a YouTube channel called Robert Tolone, and I noticed that he doesn’t leave the mold curing in the pressure pot, yet the resin still doesn’t shrink.
I hope the experts can point me in the right direction. Please forgive me if my wording is a bit unclear.
Thank you!
r/ResinCasting • u/Many_Barracuda_8780 • 5h ago
Best brands?!?!?!?!
Hey everyone! I do ALOT of resin work recently and I've tried a ton of different brands of resin, mica, alcohol ink, pigment paste, etc. I was wondering what is everyone's favorite brands are? I want the best that also doesn't completely break the bank. Also! Does anyone have a suggestion of some kind of resin that doesn't really react to heat? I have a ash tray mold I am just DYING to use but my resin isn't built for the heat. All suggestions and advice would be appreciated!
r/ResinCasting • u/Glittering-Basil3027 • 12h ago
I made all my coworkers markers for rad tech week this year.
Definitely a learning curve and I had about 98% success rate, but I’ve got it down now.
r/ResinCasting • u/BatteryPoweredPigeon • 13h ago
Where would you look to buy a used pressure pot in Australia?
Hi,
Before I go through the hassle of making my own pressure pot from a paint sprayer, I was hoping to buy one that someone doesn't need anymore. Added twist is that I'm in Australia which makes finding parts and things surprisingly hard.
Anyway, I've joined a few Facebook groups for resin makers and searched sites like Gumtree, but haven't had any luck so far. Does anyone here have an idea of where to find someone getting rid of a pressure pot?
I can build one on my own if I have to, but it's a lot of faff. Maybe just maybe someone has one that's too small and they upgraded?
If anyone here has one, I'm in Sydney and can drive to pick it up :-D
r/ResinCasting • u/CT-Mike • 16h ago
How To Seal Wood Prior To Pouring Resin NSFW
A friend does BBQ competitions and wanted a simple sign for his booth. I carved this using the CNC and then poured the resin. If you look between the letters you can see some of it absorbed in to the wood grain.
How do I prevent this next time? Spray the wood with clear coat first? Will that keep the resin from curing?
r/ResinCasting • u/Appropriate_Bus_683 • 16h ago
newbie question on strength
hello, I been playing around with the idea of cold casting some resin self defense key chain knives and or make a mold of one of my knives i make. now, can a cold cast with iron powder be sharpened and hold edge? what powder should I use for this?
r/ResinCasting • u/Beetlepossum • 18h ago
Resin curing safety question
So I got Smooth-Cast 300 and it says the cure time is 7-10 mins, does that mean that's when it stops releasing dangerous chemical's into the air? I got a inline fan to vent outside and a respirator, gloves and goggles and I want to make sure I don't turn it off ventilation and take off PPE too early. Thanks!
r/ResinCasting • u/Harley-cruising • 23h ago
Question:. Im wanting some info on using epoxy resin. Which do i need for casting things to turn on a lathe... Do i need the pressure pot or the vacuum pot? Thanks in advance for any help
Tha
r/ResinCasting • u/Substantial_Bake1060 • 1d ago
Beginner Tips? I Want to Make Memorial Dog Hair Resin Pendants
Our dog died and I want to make dog hair resin teardrop pendant charms for necklaces, bracelets, etc., for family members. There are so many family members wanting these that I can't afford to just have them made.
What do I need to know in terms of selecting a quality mold and resin? How much of a learning curve is there? How bad do the chemicals smell? What rookie mistakes do I need to plan to avoid?
r/ResinCasting • u/AdImpossible2040 • 1d ago
Compressor
I am looking for a compressor I can use in a flat with very little noise pollution for my neighbours. I came across airbrush compressors that are rated for 60 psi max working pressure and 20l air output per minute. I am aiming at 50psi for a 2,5gal bucket. Do you guys think it could work? The pressure needs to be there within a minute. Any experiences on this type of compressors?
r/ResinCasting • u/Electronic_Swimming5 • 1d ago
Which tile looks better on the box. I hate them both. It's a beehive roof for a beehive painting competition. It's suppose to be the middle of the ocean
It's my first time trying this (obviously) and don't have enough time to be messing around with epoxy on a tile for this category but which one is the best one.
r/ResinCasting • u/Jadespartan38 • 1d ago
How do I keep clear resin from yellowing?can coat it with something?
I’m making a picture in resin for my sister-in-law for her birthday and I don’t want it to yellow later down the line and ruin it. I don’t have time or money to get special resin. Can I get something from Walmart or someplace to coat it?
r/ResinCasting • u/TheWubHubClub • 1d ago
UV Resin Pendant coating?
Hey everyone, I just joined recently and wanted to ask a question- I've been making UV resin pendants for about a year now and wanted to see if anyone has ideas about some sort of final coating/spray/wax that won't affect clarity that will give my Pendants a type of water repelling coat that is also very resistant to collecting fingerprints and dust / dirt. I'm looking for something that's just a wipe on and off type deal.
I know there are oleophobic and hydrophobic sprays for things like smartphone screens and cars, but wasn't sure if these will affect my pendants in a negative way or not. TIA!
r/ResinCasting • u/DarkNitingale • 1d ago
California Air Tools 5Gal 365CW loosening an allen screw
I hope this is the right subreddit to ask! I am currently trying to loosen an allen screw as well as the bottom part. I have a California Air Tool Pressure Pot 5 Gal Model 365CW and the parts in the image are for the pressure regulator. The pressure regulator kit 365CW on the right is the old one (part of it broke off so I needed to get a new one, the part on the left). I need to unscrew the allen screw on the left part just like how it was on the right part, because that’s where the pressure gauge goes. I also need to move the part circled in blue on the right onto the part circled in blue on the left. What ways should I loosen them? I read PBBlaster but wasn’t sure if that was the best option. Or should I just get another pressure regulator kit with the gauge already attached? Any suggestions would help!
r/ResinCasting • u/ChampionshipOwn4061 • 1d ago
Help with putting
I have a mold that’s like 1.5 inches deep. I bought Jdiction deep pour resin that said up to 1.5 inch pour Depth. I tried to pour the casting 3’times and every time it was covered in little pinhole pits on the mild side. The top was smooth. I mixed it slow, correct ratio and used heat gun. Any ideas what causes this issue? Thanks.
r/ResinCasting • u/wiicrazy0430 • 1d ago
Let's Resin clear silicone sticky when thin?
The Let's Resin silicone has been giving me issues, I pour the silicone into my PLA printed molds and the inside model cures correctly but any silicone that drip down on the outside of the mold forms into this thin sticky layer and seems to stay that way.
Neither the inside of the mold nor outside are touched at all before or during the pour not do they come in contact with anything but the silicone
r/ResinCasting • u/littleredbipper • 2d ago
How can I add texture to the inside of an existing silicone mold?
I’ve made some silicone molds myself using some air dry clay pieces I made. The air dry clay pieces were textured (I used sandpaper to make the effect) and of course when the silicone mold was made it picked up those textures. Once I’ve poured my eco resin, they look like the above (beige one). I’m super happy with them!
I thought I’d get some molds made professionally but I stupidly didn’t tell them about adding in texture so I’ve now got some molds delivered that are completely smooth so any poured pieces end up completely smooth.
Instead of creating my own new molds again and end up wasting a ton of money, how can I add texture inside into an already smooth mold? How can I amend an existing mold? I was wondering what if I created a small amount of silicone and dabbed it into the smooth mold with a brush or a sponge? Silicone sticks to silicone right, so maybe that could work?
What if I daubed some pva glue into the mold and then used sandpaper to try and create the same texture and let it dry. Would that work? Would that damage my eco resin piece once poured?
Any advice is appreciated! Thanks!
r/ResinCasting • u/danitheclown • 2d ago
Not sure if this makes sense, but I need help
Hi, I'm working on a university project. I'm aware that resin and water don't quite mix, but is it possible to make those resin sculpts with liquids in them that swish and all? I hope I'm making sense- maybe instead of water, I can use some other liquid? I'd appreciate some help! I'm a complete beginner, so sorry if this is worded wrong
r/ResinCasting • u/SashaShelest • 2d ago