Sikaflex 522 is also suitable for the replacement of joints on both caravan marine and other vehicular construction projects. Sikaflex-512 Caravan is a strong elastic adhesive that bonds and seals in one operation. It is purpose-designed for building and repairing caravans, motor homes, and trailers and does not suffer from the problems of traditional mastics. Correctly installed, it will provide many years of leak-free, and trouble-free service. I look forward to other comments, agreeing or otherwise, arriving soon (hopefully they will provide links to various sources which give examples of jobs that have been done...

Sikaflex 521 300ml Multipurpose White Adhesive Sealant For Caravan Motor Home Boat Solar Panel Mounting Wood Metal Fixing Designed to bond well to a range of surfaces such as ceramic materials, plastic and aluminium, Sikaflex 552 is UV and weather resistant and is capable of withstanding high dynamic stresses.P101 If medical advice is needed, have product container or label at hand.P102 Keep out of reach of children.P261 Avoid breathing dust/fume/gas/mist/vapours/ spray.P280 Wear protective gloves/protective clothing/eye protection/face protection.P302 + P352 IF ON SKIN: Wash with plenty of water/…P501 Dispose of contents/container to … Please note the following postcodes are classed as Non-Mainland UK or Remote / Rural delivery: AB, IV, KW, PA, PH, HS, KA, ZE, PO30-PO41, IM, JE, GY, BT, TR21-TR25. Unfortunately, We Cannot Guarantee Next Working Day - you will be notified if we can't fulfill this. Very easy to use but doesn't seem flexible enough to me and may not fill the gap completely although several users appear to be satisfied.

This approach seems best, as you can put plenty on, smooth it over with normal tools before it skins plus it remains plastic over time (supposedly) ?