I completely agree with firemedic on this, also keep in mind with all the exposure to mud, dirt, salt, etc. even if the foam is "Weatherproof" if dirt gets lodged between the foam or gets into an area that the foam didnt reach it will be the dirt/salt etc. that retains the moisture and as firemedic stated it would take forever for it to evaporate.. If it were me and my truck I'd probably not do it. Just a personal opinion..

 

i work in construction and use the poly foam all the time some resist water but that is only the outside layer if you cut into some of these foams they will soak water up like a sponge. There are some newer brands of fast foams that are closed cell .i had thought about this before but i am glad i did not use foam because theres no way of knowing for sure if you have a airtight seal I say don't

 

A small 2 gallon pump up weed sprayer might do the deed?

 

if ur really concerned about corrosion inside the frame, one thing u could do is box off, plate up, or whatever parts with packets of silica gel inside with some type of brass threaded plug to relieve it, or if u have the technology, take the frame out and take it to a galvinizer, problem with that foam is once its in there, it aint coming out

 

I actually found this suggestion online as well. In fact, it seems people like to warm the oil up and mix it with some melted parafin wax. Spray the frame while it's hot and it sticks and stays.

Probably going to give that a try this fall.

 

I was out by Ashburnham last Saturday for the Tyler motorcycle ride. I don't know if you happen to be one of the lucky people that got stuck waiting for 500 motorcycles to go by or not, but if you were I was one of them.

I wasn't there for the process. I'm sure it must of smelled when they applied it but it didn't smell when I saw it. If my memory serves, and there is no real reason it should, they used a weed or deck stain sprayer like mentioned above. I'm assumming they tried to steer clear of the exhaust.

How long has the foam been in your's? I would be leary about using it too only because I would be worried about it filling the frame 100%. Any gaps at all would be a place for water to get trapped. At least if it is hollow, it can drain and dry.

 

Many years ago, I remember my Dad pouring turpentine into the door panels/rocker panels and small areas of the fender/quarter panels of his '79 Jeep after cleaning them out. He'd catch the excess run off with small buckets under the drain holes. He did that annually for the first few years he owned it in hopes of preventing the notorious body rot the older Heeps were known for. It smelled like a mobile pine factory for a few weeks afterward, but the turpentine dried and coated everything with a pine tar type finish that was pretty darn tough. He drove that Cherokee for nearly 20 years without massive rot problems.

 

I was lucky enough to not get stuck waiting, thank god!
As far as the foam in my frame, I would not personally have done it, but it was in there when I bought the truck. It has been in there for the 9-10 months I have owned the truck. The frame is solid as far as I can tell from the outside, I am a bit nervous about the possibility of the inside rotting out though. Nothing I can do about it now though. Just keep the outside clean and hope it works.

 

I'm not a fan of the foam thing either. Your going to have some scale and dirt inside the frame creating a barrier from letting the foam bond directly to the metal.

Have any of you guys checked out some products by eastwood. They have a really great paint called rust encapsulator that last much longer than rustoleum. much more pricey though. And they also have a rust inhibitor called anti rust that sets up like a wax. It reminds me of cosmolean, if any of you guys are gun fans. It smells like it but dries harder like a wax. I have used it and it works great. Makes things smell for a while though. MAKE SURE YOU DONT USE IT ABOVE YOUR EXHAUST! Man! I made that mistake and it smells for a good long time untill it melts off.

I never used the POR-15 although I heard that works great for preventing rust.