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Looking for some advice on what type of bonding material should I use to fix multiple small cracks that I've discovered on some polypropolene woofer cones.
Thanks in advance!
Follow Ups:
I have used auto gasket making RTV for small defects. Worked well. It retains a flexible quality and yet it is durable.
replace the drivers.
You need to replace the speakers. It's not possible to repair cracks in the structural diaphragm and still maintain the original structural integrity of the diaphragm. Any cracks in the diaphragm will introduce distortion and repairing those cracks will introduce additional distortion.
Sorry,
John Elison
Before you go spending tons of money... who knows? Plus it's fun to bring stuff back. If it sucks OK then at least you tried.
...by spending a few dollars for adhesive? If it doesn't work, THEN replace or re-cone the drivers.
Never underestimate the power of stupid people in large groups.
I suppose you have nothing more to lose! ;-)
What Mr. Elison said is sad but true. Those speakers might still have some use, but to listen to music you need to recone or replace them.
Sorry I don't know what type of glue to recommend. But I do know that it's hard to get a good bond to polypropolene. It took awhile until the BBC discovered what glue to use to glue the surrounds to the cones. Maybe some of the newer glues developed since the 70s will do it. Good luck.
Are they clear? Sometimes an adhesive alone doesn't work and or doesn't last with use. Think of a drywall seam. You have the paper tape then the goo working in tandem. I repaired old Altec paper cones with paper that was soaked with an appropriate adhesive then after it dried lightly spray painted the repaired area black to match the cone. Looks great I should have taken a photo.
On your cone I would custom cut pieces of clear packing tape. Iron strength and very little added mass plus simple to install. Very much easier than dealing with a wet adhesive that has to dry. Clean the cones first for best adhesion. Do both sides for best result although that likely requires driver removal.
ET
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
Rubber cement is your friend in patching the damage.
Not sure if it will fix the cracks though.
Try Loctite #495.
Never underestimate the power of stupid people in large groups.
check out Simply Speakers they have great glue products.
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