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what colour is this ?

paddy

Well-known member
Any idea what this colour is on the engine cases. I come across it a lot on bikes and cars, it looks like a king of graphite maybe ?? Often see it on raw dark alloy castings like gearboxes.

DKW 250 US 1939 Motorcycle.jpg
 
Unfortunately i cant do filler or blending, last time i tried the think i filled the gap 4 times and each time it just contracted as it dried . I can never get the stuff to key so as soon as i sand it, chunks fall out :)
 
You might try a 2 part auto filler then use a thin auto filler paste to finish up. I don't know what filler you are using, but if that is a metal tank, or even a plastic tank, if the filler isn't bonding and falling out in chunks you need to find a different filler.
 
You could try the super glue (thin type, not the gel) and baking soda trick to fill it. Just fill the gap with the glue, you may have to do short sections so the glue doesn't cure around the edges. Sprinkle the area liberally with baking soda (bicarbonate of soda on your side of the pond). Don't be tempted to press it down with your finger, let the chemical reaction happen. Let it cure for 20-30 seconds, brush off the excess and there will be a rough surface that should be hard enough to begin sanding with your favourite files and grits of sandpapers and a final buff with a cotton cloth. If there are any gaps or depressions repeat the glue and baking soda steps as required.

Cheers,
RichB
 
As @RichB stated but I will add that you can use a putty (silly putty, mounting putty, tack putty) to create a dam and keep the liquid CA on the horizontal plane as you work in sections, I would glue strip or wire in there to save on the CA. Another, expensive as you know, alternative is the UV resin.
 
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