What sealants would anyone recommend for optimal protection?

Awesome! Thanks!I love this place.

For joints I always use Loctite, the brush on kind, it goes on real smooth and dries pretty quick, it does appear glossy though but I always counter that by adding the spray on sealant, usually I use games workshop Satin sealant and have never had any problems with it, I even like the effect that Blane mentioned above. Recently I have been using Vallejo Satin and although I don't hate it, It just doesn't give the same finish as GW sealant, and it's around the same price anyway. I've not noticed any of the dust attraction that Blayne also mentioned but I'm gonna be checking them from now on so thanks for the heads up dude!!

@Blaynescott: thanks you always have a plethora of knowledge to share dude.
I have checked your sight many times and love just looking throughout it.
I appreciate the list. Your a meticulous guy. And I like that. Oh Blayne what was the name of the glue? Super glue? Crazy glue , lock tight? Just let me know. I use lock tight and crazy.

@Finn varra I am always scared of testor cause as a kid I only had ac sees to that for model
Planes and chopper models. It always gave me such a hard time( acryles) now of days I know more tricks but,
I stick to citidale. But I think I'm gonna along with what Blayne said, get some testor and others and do some test coats
On pieces. Thanks guys! If anyone has other suggestions please keep it up!

I've had very good results with Testors Dullcote. The only downside is it's horribly expensive for such a small can.

I don't have any experience with automotive stuff, but I use a few different things, depending on the type of material.

Initially for joints (or any sculpt areas that might suffer rub / chest, torso, etc.) I seal with liquid type krazy glue. I discovered the type Walmarts carry works really well, but only the normal kind (the label color is a shade of red). The Orange type - which I think is a fast-drying version - is horrible to use. It dries lumpy/scaly, completely unlike the smooth finish the normal type gives.


Post-superglue sealants:

Citadel Matte spray sealant - good for pieces that might wear if you dry to brush-on varnish, and need a level of protection immanently after the paint cures. Also, much faster than brush on varnnishes.

Vallejo Matte varnish - my favorite. Great for detail work, and has a beautiful finish + an eyedroper bottle. Also comes in glossy.

Vallejo also makes a 'satin' varnish, which has the light-reflection of cotton cloth after it dries -- but I found dust tends to adhere to it much more than other types - so I avoid using this one.

Citadel 'hardcoat' glossy varnish - good for a really glossy/thick look. (like patent leather boots)

Hope this helps.
-Blayne