Which seam sealer do you use on fender seams?

[Bmachine]

I'm about to paint the engine bay and I have prepped the whole bay and the area above the firewall. I am thinking about putting some seam sealer in the crevices above the firewall and along the fender seams. I read about several people applying it but no amount of searching revealed any preference of brands.
I don't have time to order from Eastwood so I am going to have to get something locally. Home Depot, o'Reilly's, Napa...
The one brand I always fall back on is 3M. But i believe theirs can only be applied on top of epoxy primer or 2k urethane primer IIRC.
Any other suggestions?
Thank you.

 

[GK-E30M3]

Check SEM products they sell some good stuff

https://www.semproducts.com/

 

[mulberryworks]

I'd stick to an automotive paint supplier for stuff like seam sealer. There are bound to be a number near you, just ask about what they recommend for your paint system of choice.

Ian

 

[bavbob]

Used SEM and also Eastwood. I put a small amount of paint thinner in a spray bottle and spray the sealer once applied , you can get a smooth surface with your finger or run a brush over it to get the factory look. Eastwood does make a brushable sealer but I have not tried it.