MicroLubrol StyloSeal Heavy Consistency (High Stiffness) 100% Pure Silicone Sealant & Lubricant Grease for Fountain and Eyedropper Pen Applications

Excellent seal it saved my pen :)

great for seal and lubrication of fountain pen piston after thorough wash

I put this in my jinhao 10 for a better seal and so far it hasn't dried out yet.

I had at least a couple of fountain pens (the ones I hadn't lost track of) which I hadn't been using because they leaked like sieves. I kept looking up, or trying to look up ways to seat the converters so they'd stop leaking, and never managing to get them back into working order. I finally ordered this, applied a scant amount to the converters, and have had no more problems with leaks. It was a very simple fix, and would have been a very good investment even if I'd only had one leaky pen. Thank you for reading my review. I hope you found it helpful.

Very high quality and viscous. I had leaking ink from a nib section of a Lamy 2000 and the heavy consistance perfectly sealed the threads. I also nd applied a thin coat to the piston and the oring on the nib / feed and am very pleased with the results.

It makes my Lamy 2000 much smoother. I would recommend to everyone.

Works well for any eye dropper fountain pen.

Just what I needed for my fountain pens. Fast delivery, also!