I own a 2014 street glide and I just put 4” saddle bag extensions on, what would you guys recommend to use to mold the extensions and the saddle bags to make them look like one piece? Fiberglass and resin, fiberglass body filler, or body filler?

 

Check out this thread from the forum. I think this is the info you need:

https://www.hdforums.com/forum/touri...-bags-etc.html

 

Was going to do this, however my painter said don’t. Feared the bags and any type of filler would expand at different rates and crack.

 

Agreed on the risk of cracking. 3M does make a "flexible repair material" designed to fill small gouges and imperfections on bumper covers that are a similar material to the bags. The filler material is not structural though, and that is what you would need for this application.

May a photoof the bags with the lower piece attached so we can see the fit between the two pieces would be helpful.