Resin Casting on my Own

Almost a year ago I took my first tentative steps into the world of casting my own parts in Resin thanks to my friend Ryan and a Saturday at his place working on models together with him and Trevor. Sadly, Covid has caused this to become a more common thing, as a number of us now have a Saturday night zoom chat where we all sit at our workbenches in our home and work and chat and have a drink virtually. It’s easier than packing up and going to someone else’s place to work, but not quite the same.

IMG_2453A stack of new supplies from Sculpture Supply Canada for making molds and casting in resin.

I am starting this adventure with basic stuff, two part silicone for mold making, and resin, that doesn’t require anything more complicated than mixing equal parts of the two liquids in each kid. The mold material cures it says in half an hour (I’m finding better results at giving it 2 or 3, and the resin says it cures in 10 minutes (again, half an hour or more is better). The parts I am casting are basic parts, manhole covers and storm sewer drains for the streets on my layout. I have drawn the different styles that are on Toronto streets, they will be a subtle detail in the layout, but I will know they are there and not generic, and that means a lot to me.

My first mold made at home, from top left top row: The Mold Box, the Silicone parts, measured out & bottom row: gently pouring silicone, weighting down while curing to get a smooth back, ready to demold, and the cast part.

So, full disclosure, the first mold I poured in the picture above, failed, I didn’t give it enough curing time, and it was a goopy mess. Lesson learned, be patient, just let it sit and cure, there is no rush here other than my own urges to see if I have succeeded!

Subsequent molds, see how much nicer they look when you let them fully cure?

I have two styles of manhole covers (water/Sewer and Hydro), and storm drain covers. I need about 50 of each manhole, and about 70 of the storm drains, give or take. As I wasn’t sure I would get 10 of each from each mold (manholes I am, storm drains I’m getting 9 per mold from a couple of damaged prints. If I’d have been smart, I’d have made one mold box of 10 good parts, and made multiple molds from that, instead, I made two mold boxes and made 3 molds, each with one defective piece!

Mixing resin, settling the parts, and pulling out completed manhole covers.

The nice part about the fast setting resin, is that I’ve basically made all the parts I need now. I probably need to do one more run of the five molds to have extras, then I can sit down some evening and clean all the castings and prepare them for painting and installing onto the layout. I started the roads stamping spots for the covers, I’m not entirely happy with how that worked, as I’m going to need to go back and putty around them to fill gaps. I think it will work better if I pre-paint the parts, and sink them into the drywall compound roads as they are almost dry. It will let me blend them into the compound, and they can be painted around when I paint the roads/touched up later.

IMG_2528A manhole I 3D modelled, had printed, and cast in resin in the layout. Needs painted and you can see where the roads still need some cleanup!.

This is one of those weird ones. In theory, resin parts are cheaper than 3D printing, and if I did the math of going to shapeways and getting 75 storm drain covers cast, it probably winds up being more than the resin supplies, but what’s more important than the cost is the learning a new skill. I want to, no need to do a lot of custom windows for my layout, and at the cost of having them printed, shipped, and likely paying duties, having learned how to cast means that I can print a single window master for each different one, and cast as many as I need in resin. This is where the cost savings will come down the line, in doing bigger parts for my buildings, these small street details are really just my training wheels!

IMG_2537Five full molds. Yeah, you can see some nasty air bubbles on one mold. Most of the parts are actually ok, but learning as I go to be careful pouring and working to avoid wasting resin on failed parts.

For anyone still reading, this will be post 500 on this Blog since I started writing it in May 2016. I’ve come a long way and a lot has changed since my first post, but my love of the hobby hasn’t. I hope those of you who read enjoy my prattling on as I muddle through this adventure of building my prototype layout of Liberty Village.

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