Monthly Archives: March 2015

Making Open Face Resin Molds


Making Open Face Resin Molds and Castings Demonstration Program – Monday, March 9, 2015

Silverwings’ hosted demonstration program on making open face resin molds and castings focused on the chemistry and technology use in making single mold castings utilizing silicone-rubber based Room Temperature Vulcanizing (RTV) moldmaking materials. An edited video recording of the demonstration program will soon be linked to this website.


Open face resin molds are relatively simple to make. They are inexpensive, and they consume relatively little in the way of mold making material and casting resin. They are most useful for making flat sided resin castings that will be incorporated into a model’s interior, such as an aircraft cockpit’s sidewalls, instrument panel, electronic equipment, and the like.

Typically, these castings are glued in place using their flat, unadorned side as the point of attachment. Additionally, and with careful preparation, these castings can even be used to replicate features that are otherwise available in photo-etched metal.

Wheel wells, landing gear bays, and internal bulkheads

Open face castings are particularly useful for re-creating wheel wells, landing gear bays, and internal bulkheads that define and replicate the subject’s interior components. I will demonstrate how these features can be created in a tightly controlled environment so as to minimize the need for heavy sanding and trimming in order to fit your model’s interior dimensions.

The photograph of my resin castings and mold Masters will be among those that I will show at our upcoming meeting.

B-24 Liberator landing gear bay assembly, together with working drawings, and open face molds

B-24 Liberator landing gear bay assembly, together with working drawings, and open face molds

I will also bring the model for which these components were made to show how they appear in an integrated environment. The photograph below shows how the resin castings were integrated into the upper side of the port wing half. The white surround is 40 mil (.040) sheet plastic that I used to stiffen the wing to prevent warpage.

Cast resin components assembled within underside of upper port wing half

Cast resin components assembled within underside of
upper port wing half

Replicating small details

I will also demonstrate how to replicate instrument panels and other types of equipment, such as switch boxes, circuit breakers, radio equipment and other interior details that are difficult to scratch build, and which may be difficult to find on standard hobby lists.

I will also demonstrate how open face castings can be used to accurately render flexible ammunition tracks and ready boxes so that they fit perfectly within the model’s interior, in this case, the B-24’s waist gun positions. See photo below.

B- 24 resin castings were ammunition tracks and ready boxes. Art Silen photo

I will also mention ongoing projects that will be interesting to other modelers, including a method for correcting the venerable Hasegawa Focke Wulf Fw190 A-8 undercarriage bays.

The following link is to my open face Making Open Face Resin Castings -Demonstration, March 9, 2015, handout checklist that I will refer to during the demonstration. This can be downloaded and printed. Needless to say, in the limited time we will have available for the demonstration, a detailed explanation of how we make open face resin molds could not be included in this notice. Therefore, I urge anyone interested in moldmaking to link to Alumilite’s website, for more complete and authoritative information that I can provide here.

This is an event not to be missed.