Here are some additional things to consider when using white mastic to set beige tiles:

• Porous vs. non-porous tiles: Mastic is generally a good choice for setting non-porous tiles, such as ceramic or porcelain tiles. It may not be suitable for setting porous tiles, such as natural stone tiles.
• Waterproofing: Mastic is not waterproof and should not be used in areas that will be exposed to moisture, such as showers or floors in kitchens or bathrooms.
• Flexibility: Mastic is not as flexible as some other types of setting materials, such as thinset mortar. This may be a concern if you are installing tiles on a substrate that may move or crack.

If you are unsure whether mastic is the right type of setting material for your project, it is always best to consult with a professional.