Clothes Airer & Towel Rail Mounting on Fibreglass C/van

We fitted the slide in brackets for the clothes airer, which I assume is the one you mean, to the side of our van using pop rivets as the thin aluminium doesn't stand up too well to screws. Fibreglass tends to be a little stronger to screw into so you could just use some self tappers, stainless steel of course and a dab of silicon in the hole. Just don't drill in too far and use screws that are just long enough are the only recautions I used.

We have one pair on the outer side (driver's side) and another pair on the near side so when it rains and we can hang stuff under the awning. You can get the brackets seperately from Camec.

The other method could be to use Sikaflex adhesive/sealant to glue them on. It is a polyurathene sealant that they use in the construction industry. Its available from Bunnings. I wish I coild remove all the old putty used to seal stuff on the outside and replace it with Sika.

If you can access the area on the inside I would make a sandwich by putting a strip of aluminium on the inside and bolting through (a) the towel rail, (b) the fibreglass & (c) the thin metal strip on the inside. This will spread the load along the length of the metal and prevent to bolts pulling through the fibreglass. Consider the aluminium strip to be a very long washer.

Thanks guys, very helpful. Probably agree with Wizard 1 as access is limited or non existant. The clothes airer is the removable one with separate brackets.