Undercoating/ Painting/ Spray on liner

[MyMopar]

I've read threads where people that paint the underside shouldn't drive it on the street often because the paint will chip and form a rust spot (makes sense).  The recommended route was to use an undercoating.  Others have said the best thing to do would be to paint and then undercoat.
My ? is what about the spray on bed liners, Rhino linings or Line-X?  Would this be an alternative to undercoating a car, the spray on liners can be tinted too and can be textured from rough to almost smooth.  The spray on dries almost instantly so if they were doing it on a rotisseire they wouldn't get any runs and can cover the most vulenerable part of the car, the bottom.  Has anyone given that any thought?  I know if you have a true R/T or other highly desirable car you wouldn't go this way but for a regular Joe Charger is it a bad idea?

[THE CHARGER PUNK]

i see no reason why not, on chop cut rebuild they do this to a 70 chevelle on the underside and in the trunk and just paint over it-MATT

[MyMopar]

The only thig I have found out if you want to remove it, air chisel is the easiest.  I'm not sure ow heavy it would be compared to regular undercoating and what the minimum thickness they could spray it on and have the same type of protection.  All info that I can look into if I decide to go this route.
Anyone here in the spray on business?

[Troy]

One of the local shops here sprays the bottom of nearly every car with bedliner. The stuff they use really has very little texture and they can paint over it. It's hard as a rock and seems to hold up well. I suppose it also acts as a sound deadener. No, you wouldn't want to use it on a stock appearing car because it is definitely noticeable. It's only a few hundred dollars and if your driving the car a lot or in any sort of weather then it's probably a good idea. Make sure the area underneath it is clean and free of rust or you'll just be locking all the gunk in behind it. Removing the bed liner later on is a real pain too.

If you want to avoid undercoating all together then I suggest you search some of the other threads on the topic since the factory put undercoating in the wheelwells to prevent rock chips and dings from the inside of the front fenders. In my opinion, the wheelwells won't look right painted body color. Is there a specific reason not to use real undercoating? It's easy to care for and the stuff on my car is still holding up well after 37 years. If you like the painted look you can always use single stage paint. It's simple to touch up and as long as you check it periodically you shouldn't have to worry too much about rust.

Troy

[daytonalo]

Yo guys , why overcomplicate life , lets spray it with titanium and then paint . No really buy a shultz gun and use low pressure and duplicate the factory look . I don't know about others but my cars never see any bad weather EVER!                                         Larry

[MyMopar]

When done my car will never see any weather either.  I'm not sure why I even bothered looking into this, but I did.  I like to feel like I explored every option before moving forward, that way I am confident in my decision.  I will probably just go with factory undercoating.
Thanks for the info.

[rare69]

my cousin owns a custom hot rod and restoration shop, and does a lot of muscle car restorations. very nice work! and uses this stuff called rock guard. he sprays it on the bottom of car and in the wheel wells.while its on a rotisserie. it has about the same texture as the original under coating. then he paints to match body color, looks great and protects forever.if it gets dirty you just whip off the dirt and it looks like new.