Is tanning spray on lotion permissible?

Q: Salams, quick question, is spray on tan haram for my wife to put on?

A: 

الحمد لله رب العالمين والصلاة والسلام على أشرف الأنبياء والمرسلين، سيدنا ونبينا محمد وعلى آله وصحبه أجمعين. وبعد

The origins of things that do not have any connection to specific rulings of Halal (legality) or Haram (prohibition) are deemed permissible, thus, this is what the Scholars of Usool state: "Al-Asl fil Ashya al-Ebaha/The origin to all matters is permissibility." Hence this is also known as Istishaab al-Haal, as Imam Hassan Ibn Shahab al-A'kbari al-Hanbali (d. 428H) said: "Istishaab al-Haal (Presumption of Continuity); is remaining upon its original ruling. meaning, evidence that the Fuqaha (Islamic Jurists) fear has no linked proof to it, therefore they cross-reference it through analytic proof which connects with something else."  [Sharah Risalatul-A'kbari fi Usool al-Fiqh, Dar al-Kunouz al-Ishbielliya, Riyadh (2007): P.165] 

Furthermore, it is not form the methodology of Ahmad to name things Haram unless they are clearly pronounced by the Shariah, rather he would avoid it. Shaykh Ibn Uthaymeen said: "Imam Ahmad would not declare something to be Haram unless the Shariah explicitly stated it to be prohibited or detested, such as someone that permits something which deemed Haram, he would respond saying: 'I dislike it, or it is inappropriate, or I do not like it, etc'. therefore, one should not impulsively proclaim something is Haram, because they will be held accountable for it (one the day of judgment), and i is something which is not to be taken lightly." [Fatwa Ibn Uthaymeen]

Conclusively, it is permissible for anyone to use spray on tan lotion in the realms of their own home, the only thing that could be taken into consideration of it being Haram is if the tanning spray was permanent skin pigmentation which is considered changing Allah's creation and is a cursed action. Another reason is if one was to spend extravagantly on it, for verily this is also another prohibition of the Shariah which must be avoided. Also, if this was to be done in a beauty parlor where one was to expose their Awrah then this would also be impermissible and must be avoided too. Other than this there should be no harm in doing so, rather if this was done by a wife for beatification reasons for her husband or vice versa, it is a recommended praiseworthy act.

والله اعلم.