started making models of them and casting them in white metal. When i
first started i used the metal that came with the handcasting starter
kit i bought. It was OK for some things but as it cools with a matt
finish it wasnt as good for other things (such as the lightbars, which
get painted metalic blue, so a shiny silver base gives much better
results) so i bought some some different metal which was KA Low Melt
Alloy, which cools with a nice shiny surface - perfect just what i was
after, apart from one promlem i just can get any castings to come out
good.
Ever lightbar ive tried to cast, comes out with dimples in it. At first
i thought i migt be the mold so i tried the older (matt finish wm) in
the mold and it gives a perfect smooth casting, new metal dosent.
I check the info for the metal and it says porosity problems indicate
the metal has been over heated - which is the problem i am having but
cant under stand because as soon and the metal has melted in the ladel i
pour it into the mold.
Ive tried load of times, and at first thought i could be air getting
trapped in the middle of the mold/lightbar so made small channel for the
air to escape into - still didnt work, tried moving the model side to
side to help the metal flow still didnt work.
This metal should have better flow properties better for finder/smaller
detals yet it seems to be worse and musch more of a pain than the
cheaper metal.
Anyone got any suggestings as what could be causing the problem
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Diecast Fire & Police Service Models
Collection and Custom Conversions
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