Reddit mentions of Waterless Razor by Venus - Shave Anytime Without Water

Your lubrication is acceptable, though not great.

Your razor has too many blades, & you are clearly using too much pressure. Less blades is always better.

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If you want to stay with Dorco Shai, then Dorco also has a 3-blade cartridge that should fit on your handle.

https://www.dorcousa.com/shai-3-cartridges-4-refills/

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This is the smallest change you can make. With light pressure, it should reduce the razor burn you're experiencing.

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Unfortunately, Dorco does not have cartridges with less than 3 blades in womens razors.

Venus does, though.

If you are willing to migrate to a different handle/system, Venus even has a single blade razor.

It's called the Waterless by Venus.

https://www.amazon.com/Waterless-Razor-Venus-Anytime-Without/dp/B01N63A38V

It's a single blade razor with gel contained in the handle. The razor is superb, but the gel is truly terrible. It's actually medical jelly, not shaving gel - so that it can be left on. Whatever you do, don't use the gel except in emergencies. Use the Satin Care you currently use. Completely ignore the gel.

Replacement cartridges are available, but only online. Waterless by Venus uses the same cartridge from the men's Guard razor, so search for Gillette Guard cartridges.

https://www.amazon.com/Gillette-Guard-Razor-Cartridge-Blade/dp/B01MU7J4DC/ref=sr_1_3?crid=3MNL4HOS1BBXA&keywords=gillette+guard+cartridge&qid=1558947379&s=gateway&sprefix=Gillette+Guard%2Caps%2C428&sr=8-3

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https://www.amazon.com/Gillette-Guard-Shaving-Blades-Pack/dp/B078WWL54T/ref=sr_1_5?crid=3MNL4HOS1BBXA&keywords=gillette+guard+cartridge&qid=1558947379&s=gateway&sprefix=Gillette+Guard%2Caps%2C428&sr=8-5

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This is a slightly bigger change for you to make. With very light pressure, it should reduce or completely eliminate the razor burn you're experiencing. Since these are single blade razors, pressure has to be kept light. These cartridges do not have any gel strip or lubricant in the cartridge, so your satin care must be spread properly.

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If you are willing to migrate to a completely different platform, I'd advise you to consider using a safety razor. Maggards makes ladies starter kits with razor, blades ,soap & shaving brush all included in the kit.

This system has the potential of giving you very good shaves, but you will have to re-learn shaving technique, as these razors are used very differently from cartridge razors.

https://www.maggardrazors.com/product-category/ladies-corner/kit-and-t-shirt/

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Using a brush & shaving soap is recommended. I do not advise using your satincare gel with a safety, though many do.