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That makes sense, I only waited about 4 hours. I am new to Milliput so will give it a full day next time. I appreciate your in depth response. After your numerous examples of using it I acquired some for myself to give a go. Thats why I went to the source as it were for my question.Thanks Paul and John.
Robert, unless the area of Milliput is very thick, then a rotary tool will probably be far too powerful and aggressive, as it is with most areas of plastic modelling.
Carving can be done with a sharp scalpel blade, using the edge and the point lightly, and only 'cutting' to a very shallow depth with each stroke.
The Milliput will only crack if it is 'attacked' deeply and with pressure, or, if incorrectly mixed, or not fully cured.
The trick is to try to achieve as near to the required finished shape as possible when applying and moulding the putty, then lightly sand and shave to get nearer to the shape, progressing in stages until the final, very fine sanding - I use worn 1200 grit wet and dry, used both wet and dry.
To make indentations in the putty when making objects such as, for example, parachute packs, this can be done after shaping the item, then letting it set for about an hour, before gently pressing or scribing the required line or shape, using either the tip of a fine scalpel blade, or a pin or similar tool.
A lot of the carving is actually more like shaving, using the edge of the scalpel blade on the backstroke, at an angle of around 45 degrees.
Note that all of this work should be done only when the putty has fully set and is rock hard, which, depending on the depth or weight of the putty, and ambient temperature, could be up to 24 hours.
Even if the surface seems rock hard after, say, three or four hours, it's best to leave it to fully cure, as. below the surface, it might still be slightly soft, and this will cause cracking when worked.
Hope this helps..
Brand new blade installed! I will give it a full 24 hours to set, the layer is only 1 to 2 mm thick I am working with. It is on the horrible seam where the nose cone goes on my Lightning for the GB. This model has no less than 5 different types of putty in and on it as I have been experimenting with the different types to see what works for me. Now it is Milliputs turn!Thanks Andy and John. Having a couple of hours break from working on this wonderful example of precision injection moulding, but should be back later with another installment of "Honey, I wrecked the kit".
Robert, the longer the 'Milliput' is left, the harder it gets, even when the curing process is complete.
I left the areas on this build for a couple of days, before carving the intercooler vents, as i knew that, being fairly thin, and even with a very delicate touch using the various tools, some surface 'crumbling' could occur, albeit very minor. However, as the vent slots are only around 2.5 mm wide, and the depth of putty is about 1 to 1.5 mm, even minimal crumbling or cracking would ruin the shape.
When working with 'Milliput', and cutting or carving, a very light touch is required, and it's best to more or less shave thin slices, rather than try to cut one large area.