THE BASICS ON RESIN CASTINGS:
- Remove excess flash, casting sprues. No.11 Exacto or your favorite hobby knife with a fresh blade works well in some of the cases. Use back side-square edge of the blade to scrape resin to remove shavings.
- Consider gluing or use 2 way tape to affix the casting to a temporary “holder” (1″ round wood dowel 1 to 2″ long) for cutting or painting it. This make a neat handle to hold the model during the processes of trimming and painting.
Another method of holding while trimming the excess resin is to place it in a vise. Cushion the jaws. Use a wood block to prop up the wall sides of the casting so not to crush it the clamping force.
- Wash with soapy water before painting process. No release agent was used in the casting process therefore no special “resin prep” is necessary to treat the casting(s).
- Let dry.
- Prime with an acrylic primer/paint using spray can application in the appropriate base color is recommended.
- Finish as required to achieve desired look using application(s) of paint, washes, stains, weathering powders( preferably PANPASTEL MODELING COLORS), chalks, inks or stains.
- AC (Crazy Glue) type adhesive is recommended to glue 2 resin parts together or to a part of a different material.
- White glue provides a semi-permanent bond when gluing the resin casting to the base of your project.
- Small air bubbles may have formed in the casting during the process. The holes can be filled with a filler, modeller’s putty , Bondo or a tiny drop of AC glue.
FOR THE KITBASHER:
- Resin can be cut, sculpted, textured or sanded.
KEEP IN MIND:
- Safety first. Appropriate dust mask, eye and/or ear protection is recommended when cutting, drilling, sculpting or sanding a resin casting.
- This product is not a toy and/or intended for children. Small detail parts are a choking hazard for children.
LED TIPS FROM OUR SUPPLIER, EVAN DESIGNS HOBBY LEDs:
Wire LEDs in parallel.
Power Supply Considerations
LEDs draw 20 milliamps each so
- With a plug in power supply of 1 Amp you can run 50 LEDs.
- With a 3 volt coin type battery you can run up to 10.
- With a 9 volt battery such as a Duracell you can run 50 LEDs for 4-5 hours.
- Train transformers are often 5 amps, so LEDs will draw a small percent of the total available
Attaching LEDs to your Project
Don’t use a hot glue as it is too hot for LEDs.
- Duct Tape
- common white glue
are all good choices for holding your LEDs in place
Fitting into tight spaces
The stalk of the LED, up next to the bulb can be bent 90 degrees for gluing to the ceiling (to have the light shine down) or for taping in behind a lens. Use a pair of pliers to hold the bulb stable while bending the stalk.
Making holes if needed
Drilling die cast metal takes a very good quality drill bit. Get a set of Cobalt bits from a quality hardware store for drilling die cast metal. Here are some drill bits we have used for various projects:
Drill Bit Size === English
Only tip of LED showing
Whole LED showing
Notes on 1.8mm LEDs…
the base of the LED is square, which makes it a little tricky for round holes. When we drill the 5/32 hole we bend the stalk of the LED 90 degrees and tape it from the backside. This will keep the LED firmly in place.
Increase the light spread
LEDs have a fairly wide spread, if you need more you can sand the top rounded part of the LED flat.
Do not sand down to the metal you can see inside the bulb.
Decrease the light
Lights too bright? The easiest way we have found is to add a bit of similar colored paint. Acrylics take the brightness down approx. 50% while enamels cut the brightness 25%.
To paint an LED,
- Thin a little of your chosen paint down with thinner or water. You want to have your paint flow easily on the LED surface.
- Let the paint dry and light the LED up, lightly sand any dark/thick patches with fine sandpaper or fine steel wool.
- Several very light paint coats are better to achieve the desired effect than 1 heavy coat.
- Standard paint thinners: acetone, etc. will not “dissolve” or otherwise harm the LED. We soaked an LED overnight in acetone. No effect.
We have tried different resistors and found them to make non-linear difference to the brightness.