What immediate action should be taken if the lash adhesive appears too thick?

When dealing with lash adhesive that appears too thick, the most effective immediate action is to swipe the extensions for smoothing. This approach is beneficial because light swiping can help to evenly distribute the adhesive, allowing for better application and reducing the chances of clumping or inappropriate bonding. Maintaining a smooth and even consistency is crucial in ensuring that the extensions adhere properly and look natural.

The other options can have drawbacks. Discarding the adhesive immediately might result in unnecessary waste, especially if it can be corrected. Thoroughly mixing the adhesive could also achieve some improvement; however, it doesn’t specifically address the immediate issue of the thickness that you're facing. Adding a diluting agent might seem like a solution, but it can compromise the integrity of the adhesive and lead to unsatisfactory results. Therefore, swiping the extensions for smoothing is a practical and immediate method to ensure proper and effective application.