Chevy Astro and GMC Safari Forum banner

Using Expanding foam & fiberglass to fix rust holes?

35K views 8 replies 7 participants last post by  toddb  
#1 ·
Hi, it may seem a little stupid but i was thinking of patching up my rusted rocker panels with expanding spray foam then fiberglassing over it. I'm just looking for a cheap way of fixing them since i don't know how to weld and i don't wanna spend the money on labor to take it to a body shop. I know the rockers are an important part of the structure of the van. But this has be better than just doing nothing at all and letting it get even worse. I got this idea when i saw this guys 89 voyager on cardomain. http://www.cardomain.com/ride/321255/13 This guy is a genius!! all the custom stuff to his van he did himself. and he used that spray foam/fiberglass to create a custom front lip.
So what do you guys think?

These are some pictures of my rockers that i took almost a year ago (they have gotten much worse now :( ) :
http://img125.imageshack.us/my.php?imag ... 342dj4.jpg
http://img520.imageshack.us/my.php?imag ... 341dq5.jpg
 
#2 ·
Yeah, that's really creative. You can do that with the rocker panels. Just make sure you cut out ALL of the rusted metal and treat the rest of it (POV-15) before you start with the foam. Luckily you have the running boards so that will help protect the fiberglass from all types of road debris.
 
#5 ·
Hi fede
Thanks for the links, that guy sure knows how to fabricate, great job. I think the running boards on your van were the main cause of the rust. They have a tendency to trap moisture in between the gaps and have no way to dry out properly.

As others have stated, I would really check the whole under carriage out to see if it's really going to be worth fixing it. If it's just the panels you posted that have that much rust on them, then you should be able to fix it without to much problems. Follow the advice of others that commented and please keep us updated, Thanks.:)
 
#7 ·
Thanks for the replies, i have checked the undercarriage and its in really good condition ill take a couple pictures when i get a chance, basically the only rusted area only my van is the rockers. I ordered the POR-15 kit that comes with a cleaner and prep today.
 
#8 ·
fede said:
Thanks for the replies, i have checked the undercarriage and its in really good condition ill take a couple pictures when i get a chance, basically the only rusted area only my van is the rockers. I ordered the POR-15 kit that comes with a cleaner and prep today.
Is that the starter kit? If it is, it is not enough. Its never enough. If you can add to that order, I would suggest adding at least a quart of the POR-15 (thanks leeann).
 
#9 ·
Hi, Ive done poor man body repair before. I did not use foam beacaus it will retain moisture and cause the repair to fail in short order. I used chrome tape ( it is like duct tape supper sticky and fairly stiff ).

1 - Grind arear to be repaired to bare metal
2 - remove as much rust and debris as possible behind/inside hole.
3 - treat inside of vehicle rust spot with some sort of rust paint (POR15)
4 - form chrome tape to cover hole
5 - use long and strong (kitty hair) fiber glass for first coat
6 - finish up with regular body filler
7 - paint inside of repair with more rust paint to keep water out.
8- people wont know it's not metal inside or out with out a magnet.

I've also used metal and rivets in the same fashion. both methods last for years and years if water can be keeped out of repair