Charak Samhita
अतिस्निग्धोऽतिद्रवश्च लेपो यद्यवचार्यते । त्वचि न श्लिष्यते सम्यङ्न दोषं शमयत्यपि ॥१०५॥
The pralepa applied externally that is either too unctuous or too fluid does not adhere properly and therefore cannot alleviate the diseased condition.
english translation
atisnigdho'tidravazca lepo yadyavacAryate । tvaci na zliSyate samyaGna doSaM zamayatyapi ॥105॥
hk transliteration by Sanscript