Keep in mind I used the 32ox Powermold and not the standard CompsiMold material when reading the following. Not too certain however any results would be different.
I cant really recommend this stuff due to its issues with bubbles. I followed the directions carefully heating the material one minute at a time, stirring and heating till it was very fluid. Even when using the most cautious and thin as possible thin stream of the stuff held at a decent height above the part, as mentioned scooped and layered over the parts with a stir stick, it has bubbles. Whats worse is you cant see these bubbles, I looked very closely before pouring more and couldnt see them. No I didnt "dump" any of the material as I was after the best possible outcome. If this were silicone the bubbles would have had the chance to rise. I also wouldnt use a chip brush to move the stuff around a part as I believe with the materials consistency the brush would just bring more air bubbles into the mix.
This was done over various parts consisting of brass, steel, aluminum, chrome, lead and plastic. The material stuck to none of the parts being molded. It did however eat into the poster board that was used for the walls and base. Normally I use styrene for that and did on a single wall. I was more or less curious to the materials reaction to either and was certain the material would eat into the poster board but silicone does not when treated with vaseline or mold release. In this instance I used both as the mold release was needed for the metal parts to held keep the shine. Seems the heat of the Composimold had its way with both the mold release and the vaseline.
One other test was to see how the material would do when you dont have enough material and need to do a second pour. I did this by molding three inert 9mm pistol rounds. The tips were left with a top layer as good as the material would take. There is no way a second pour could be done on a part. Air bubbles flock to uneven surfaces. In fact if you eye the upper right in the first picture you will see a number of bubbles near the surface. This was from trying to get a single smaller bubble away from the part! This again brings me to the theory a brush will not work with this material.
Ill pour some parts over the weekend to see how usable or salvageable they can be. I have zero hope the parts will be usable as the two smaller badges are meant to be for remastering. The other two large badges were just to test surface and material reaction to the Composimold. Not even with a super smooth surface were air bubbles impervious.
My final thought, if your on the road or location, in a pinch this stuff could pull a simple mold. The end result inst for props or items to be viewed under scrutiny.