Underseal or not?

[DomP182]

I've been tidying up my bent jacking points, removing rust with Bilt hamber products and respraying back to body colour.
Im trying to decide whether to cover the whole sill area behind the side skirts with dynax ub before putting them back on or leave as an easy clean area. I plan on reattaching the skirts with stainless button head bolts and nyloc nuts for regular easy maintenance

 

[Brigsy]

Get some protection in there if used in winter, or the rust will still slowly creep in.

 

[DomP182]

Get some protection in there if used in winter, or the rust will still slowly creep in.

Definitely on the outside? I was going to do the insides and flood it with s50 or similar

 

[Brigsy]

I would do the outside behind the sideskirts with something clear before refitting, will last a long time once done.

 

[DomP182]

I would do the outside behind the sideskirts with something clear before refitting, will last a long time once done.

Only got dynax ub in black but it wont be seen if I mask off above the side skirt i guess