[CentOS] sticky folder permissions

[Tom Brown]

>> Is there any way i can make /opt world readable and make sure these 
>> permissions stick to all subfolders and not allow users other than 
>> root/sudo to change them?
>>     
>
> Make it a seperate filesystem mounted read-only, then remount it rw when
> you need to make changes.
>   

i cant as the applications need to log there - i just need 'everyone' to 
be able to read there - i would have thought i could somehow stick the 
read permissions but it seems that perhaps not.