'Plastic Wood' equivalent for gunmetal ?

metalmangler · Oct 21, 2022

I'm looking for the equivalent of Plastic Wood to fill small holes in gunmetal castings. Some of the holes are machined surfaces (oops). Is there a one-part equivalent for metal ? and will it need the machined surfaces to be etched for adhesion ? Colour is unimportant as it will be part of a painted object.

modelbuff · Oct 21, 2022

metalmangler said:
I'm looking for the equivalent of Plastic Wood to fill small holes in gunmetal castings. Some of the holes are machined surfaces (oops). Is there a one-part equivalent for metal ? and will it need the machined surfaces to be etched for adhesion ? Colour is unimportant as it will be part of a painted object.

I have used JB Weld on many projects to correct flaws. It bonds well to the surface and can be painted or powder coated.

abby · Oct 21, 2022

Almost any filler will work if the surface is only to be painted , for visible surfaces I have some powdered bronze which can be mixed with Araldite and pressed into the holes , when set it can be sanded down .
You could even fill the holes with soft solder or ,if the part will stand red heat, silver solder.
Dan.

Scott_M · Oct 21, 2022

All of the better choices will be 2 part. If you really need it to be 1 part and the only real requirements, are it sands and can take paint then just use Plastic Wood. It sticks to most anything clean, if you've ever left a putty knife sit too long after using the stuff you know.

It is actually pretty tough stuff. Nothing like metal filled Devcon , or the already mentioned JB Weld.
But Plastic Wood will stick and take paint. But I'd use the JB Weld if you can.

Scott

JohnBDownunder · Oct 22, 2022

I am with modelbuff in using JB Weld. I used it to patch an oops on my mill table, (bit too deep with 6mm drill). Clean out the divot (Brake cleaner because I had some) then fill with good old JB. Leave overnight to cure, then a bit of sanding and since JB is grey it blends in with the cast iron of the table.

terryd · Oct 22, 2022

metalmangler said:
I'm looking for the equivalent of Plastic Wood to fill small holes in gunmetal castings. Some of the holes are machined surfaces (oops). Is there a one-part equivalent for metal ? and will it need the machined surfaces to be etched for adhesion ? Colour is unimportant as it will be part of a painted object.

One more vote for JB weld, overfill and rub down on abrasive paper.

metalmangler · Oct 22, 2022

Looks like JB is the best choice then, thanks all.

'Plastic Wood' equivalent for gunmetal ?

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