Some of my molds are quite small..example 2 or 3 grams total resin required. I always have other extra molds standing by to pour the excess resin in if needed. I tried to do a 6 gram (aprox.) pour with less than desirable results. First thing I noticed was that it didn't seem to be mixing like it should...it didn't have the same color as the bigger pours that I have recently done (30 - 50+ Grams) the second issue was that it never cured. Did every thing like I have been taught...shake the jugs, heat the mold, condition the mold with mold release, proper mixing etc. etc.
If nothing else I guess that I could mix 20 grams and pour more molds which would be o.k , but not something that I would want to do every time I want to pour a small, few grams mold.
Think about it this way ... if you are off .5 grams (very small amount) of a 20 gram of A and 20 gram of B mix ... you are off only .5 grams of a 40 gram batch which is approximately 1.2%.
However if you are off .5 grams (very very small amount) of a 6 gram total mix ... you are off 8.3%
The problem comes in the gram scale. Most accurate gram scales go to the nearest 1 gram. If you are measure 3.0 grams of part A the scale will read 3 grams. If when pouring the B side you pour 3.9 grams ... the scale will also read 3 grams. When you could be off 25% from A to B.
IF you are able to accurately measure the exact same amount of A and B, the RC-3 should work the same as if you were mixing larger amounts 40-50 grams. You will want to preheat your mold to achieve consistent cure speeds and color as you normally do with your larger pours.