Sealing grout?

I've just regrouted my shower using Mapei buildfix flexible wall & floor grout. The joints where raked but not completely dug out, the original grout was old and discoloured but had not broken away just needed freshening up, do I need to seal the new grout joints as the grout? Below is the info on the grout.
Durable, polymer modified water-repellent cement based grout for interior and exterior use on walls and floors. For joints up to 6mm wide. Suitable for commercial and domestic kitchens, showers, bathrooms, conservatories, balconies, terraces, underfloor heating and timber floors. Flexible.

• For Use on Walls & Floors
• Water & Frost-Resistant
• BS EN 13888 CG2
• Powdered Grout: Easy to Mix & Apply
• Flexible & Durable
• Anti-Ageing & Anti-Weathering Formula

 

You don't need to seal grout. its not waterproof but its more than capable or repelling the water.

 

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