Post by reuben on Nov 11, 2015 11:02:15 GMT -5
So I've been casting a the cells of a Banksia pod and the process has been to place equal weights of A & B in two separate cups. Dye A with green, pearl essence and gold then pour equal weights of the A mix and B in a separate smaller cup adequate to fill all the holes in one face of the banksia block (Sides have been squared). Painters tape is placed around the face to provide a .5" lip to catch anything that might fall over the edge.
The small cup of A&B are mixed and poured into the holes on the pod face.. Pushing a small thin wire in to the holes to release any trapped air. This all works fine, however when it starts to cure/set I see it starting to "foam".. after a while, as the mix cures I see a raised bump over each hole (I think from the foaming AB mix)..
The A & B haven't been heated and are probably about 70 degrees or more during casting..Thee first three sides weren't cured under pressure.
I casted the last face this morning, and saw it start to foam.. This one I put under pressure to cure (just took it out and some of the foaming was mitigated but not all.
Any insight into what is causing the foaming (with cloudiness)?
This is the first time in all the castings I've seen this phenomena with clear. The original banksia pod was cast in a mold and this step is just to fill in the seed holes that were not filled completely; In essence, the holes are partially filled with cured A&B..I'm only adding to fill them flush with the surface.
Reuben
The small cup of A&B are mixed and poured into the holes on the pod face.. Pushing a small thin wire in to the holes to release any trapped air. This all works fine, however when it starts to cure/set I see it starting to "foam".. after a while, as the mix cures I see a raised bump over each hole (I think from the foaming AB mix)..
The A & B haven't been heated and are probably about 70 degrees or more during casting..Thee first three sides weren't cured under pressure.
I casted the last face this morning, and saw it start to foam.. This one I put under pressure to cure (just took it out and some of the foaming was mitigated but not all.
Any insight into what is causing the foaming (with cloudiness)?
This is the first time in all the castings I've seen this phenomena with clear. The original banksia pod was cast in a mold and this step is just to fill in the seed holes that were not filled completely; In essence, the holes are partially filled with cured A&B..I'm only adding to fill them flush with the surface.
Reuben
