tarte Opening Act Lash Primer conditioning lash base, full-size white-tinted primer with vitamin C & castor oil for fuller, smooth

tarte Opening Act Lash Primer is a white-tinted conditioning lash base that primes, lengthens and adds visible fullness so mascara applies more evenly and lashes appear thicker.

This lightweight primer doubles as a lash treatment and makeup base: the white-tinted formula smooths and coats each lash while actives like vitamin C, castor oil and plant-derived cellulose help condition and support a fuller-looking finish. Designed to be used alone or under your favorite mascara, the primer’s 360° magniLASH brush delivers an even, clump-free coat from root to tip.

How does this primer improve mascara performance?

The primer creates a thin, uniform layer around lashes so mascara attaches better and fans out more predictably. By providing slight thickness and tack, it helps mascara separate and build without heavy clumping, amplifying length, curl and volume for a bolder final look.

• 360° magniLASH brush ensures even pigment distribution on each lash
• White-tinted base increases visible fullness before mascara
• Formulation promotes smoother mascara application and layered buildup

What ingredients are in the formula and why do they matter?

The blend focuses on lash-conditioning and application support rather than harsh additives. Key components include plant-derived cellulose for natural thickening, carnauba wax to help hold shape and olive esters to smooth and condition lashes; vitamin C adds antioxidant-friendly support for overall lash appearance.

• Cellulose: plant-based thickener for fuller-looking lashes
• Carnauba wax: helps maintain curl and separation
• Olive esters and castor oil: surface conditioning for smoother mascara glide
• Free from parabens, mineral oil, phthalates, triclosan, SLS and gluten

Is it safe for sensitive eyes and contact lens wearers?

tarte formulates this primer to be eye-safe and gentle; it is ophthalmologist tested and labeled safe for contact lens wearers. Dermatologist testing and a clean-ingredient approach reduce the likelihood of irritation for many users, though patch testing is recommended if you have known sensitivities.

• Ophthalmologist tested and contact lens friendly
• Dermatologist tested for skin compatibility
• Vegan and cruelty-free; suitable for many sensitive-eye users

How do you use the primer for best results?

Apply one even coat from the base to the tip, then either follow immediately with mascara for layered intensity or allow a few seconds to set for extra holding power. Use the 360° brush to reach every lash and avoid back-and-forth stroking that can cause clumps.

• Start at root and wiggle wand upward to coat each lash evenly
• Apply one thin layer for natural volume, two for a more dramatic base
• Finish with your preferred mascara for added length, curl and volume

Who is this for: Ideal for anyone who wants lashes that look fuller, longer and better defined—especially those who struggle with mascara flaking or uneven application. It suits contact lens wearers and people seeking a clean, cruelty-free and vegan lash primer that also offers conditioning benefits without heavy, sticky residue.

Ingredients

Please refer to product packaging for the most up to date list of ingredients and country of origin. Water/Aqua/Eau, ethylene/VA copolymer, copernicia cerifera (carnauba) wax/cera carnauba/cire de carnauba, hydrogenated olive oil stearyl esters, glyceryl stearate, nylon-12, cetearyl stearate, stearic acid, palmitic acid, triethanolamine, silica, hydrated silica, phenoxyethanol, hydroxyethylcellulose, hydrogenated castor oil, synthetic wax, cellulose, dimethicone, babassu oil glycereth-8 esters, cetearyl alcohol, ascorbyl palmitate, ethylhexylglycerin, disodium phosphate, polysorbate 60, tocopherol, sodium phosphate.