Hello,
if you talk about products, than I suppose it is VirtueMart - related?
If so, then it should work if written correctly. The extensions are always component - related, not module - related.
So in case the module respect the Joomla or VM API, the links should be SEFed automatically.
However, many modules are often written in very dirty way by their authors, not respecting the API and then the SEF methods might not be called at all. In such case the module code may need some adjustmenst. (making sure the right methods are colled); However this is beyond the support related to the VM extension, so either you need to contact the module author or we can check it as part of paid support service for you.