I was just reading one of the other posts and someone suggested putting some wood under the body to increase strength.

Well that got me to thinking as so rarely happens (yes I do have a headache now) and I was wondering would it be worth covering the underside with a thin layer of fibreglass? not so much to add stiffness but I was thinking more to protect it from the elements and to provect the scraping of policemen.....sleeping ones that is.

Anybody tried it? any thoughts?

Paint it. If you scratch it you paint it again, no problem

I've been thinking about applying some underbody sealant to exposed chassis rails underneath. I think other people have also added this to the underside of their wheel arches to protect the GRP from stone impacts.

Are you thinking to fix a sheet of GRP underneath or actually mould it onto the car?

If the latter then I'd be worried about trapping moisture against the chassis!

Nick

Tried it... didn't find a police officer yet to trial fit....

I used an alloy plate on a Tiger Cat to protect the pulley and belts and to get a better airflow through the rad.

See attachment ---> photo archive (attaching is too difficult for me)

[Edited on 31/5/05 by tiger7]

I use Stone Chip its the almost hard setting sealant they use under wings and lower body (sills etc) on Cars. It can be overpainted, and works well.

I get the tins that go with the Schulz gun. Easy with an Air Compressor. Makes a good finish, and doesnt chip from the stones (Thats its Job).

Easy to apply, and easy to recover if you scrape some off. It goes off fairly hard, unlike underseal that will stay fairly loose.

It will also seal up gapsa between the frame and the floor. But I use Seam Sealer for that.

I used a 3M chip-proofer years ago that I used on the underside of my emmental-effect citroen AX (first car). It came in spray tins, could be applied to the top-coat and gave a transparent dimpled rubber effect finish. Felt very much like ultra-bouncy silicone sealant and was very effective. It was about a 2mm depth i think.
Can't remember what it was called or if you can still buy it - useful post, eh?
There's probably a half used tin of it somewhere in the depths of my old man's garage so i can probably find a name if anyone wants.