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I have recently made some sprue goo and am curious for those that have cooked some up what ratio do you use?

I had about a 1/4 bottle of plastruct cement that had a bunch of floating plastic(trimmings that got stuck stuck to brush) & just started adding cut up sprue ti consistency was "right". It seems to be working as "advertised" but maybe a specific ratio is best?

Any experience is helpful.

Thanks

I was just thinking about this. AFAIK, Plastruct plastic weld is mostly MEK (which is much cheaper in a hardware store tin than Plastruct) and I already have a tin from the hardware store that I use to refill my Plastruct bottles.

I figure I'll just take one of the bottles, fill it partway with MEK and then add sprue until it is the right consistency. Given the different amounts of solvent in different glues, I don't think there is a "right" way to do it.

What are you using the goo for?

Securing magnets to bottom of bases, filling in gaps on questionable plastic parts, etc...

Basically, I got tired of magnets coming off of bases when using superglue and have a ton of sprue laying about & wanting to economize and reduce/reuse stuff.

Would that work at all though? Sprue goo is made from plastic cement, and plastic cement doesn't bond with magnets, as they aren't plastic. How are you getting them to stick to the goo?

If you completely cover the magnet, you have essentially encapsulated it in plastic that is one with the base. So it's basically "inside" the base

Racerguy180 wrote:
If you completely cover the magnet, you have essentially encapsulated it in plastic that is one with the base. So it's basically "inside" the base

That seems way more trouble than buying some better super glue. It sounds like yours is old or you're having issues with how you're using it. There's no way magnets should pull off once it's fully cured.

Nope brand new completely covered in krazyglue...3-4days before I put it on the tray and pick up the minimizing stays in hand, magnet on tray.

And it takes the same amount of time to glue as it does to fuse it to the base

 feltmonkey wrote:
Would that work at all though? Sprue goo is made from plastic cement, and plastic cement doesn't bond with magnets, as they aren't plastic. How are you getting them to stick to the goo?

The main point of gooing the magnet in is to have more surface area to glue to.

Yo7 wrote:

Racerguy180 wrote:
If you completely cover the magnet, you have essentially encapsulated it in plastic that is one with the base. So it's basically "inside" the base

That seems way more trouble than buying some better super glue. It sounds like yours is old or you're having issues with how you're using it. There's no way magnets should pull off once it's fully cured.

Not really.

The easiest way to break a magnetic bond (to remove a magnetised base from a steel sheet) is by twisting and lifting, not pulling straight off.
Ironically, these are the sort of forces that superglues are also very weak to. They are strong against perpendicularly applied forces, less so against shear stresses from twisting.

Encapsulating the magnet gives you the best of both worlds. Magnet can't pull out, even if the glue bond is broken, and the sprue gue chemically bonds to the plastic base making it all one piece.