Plus sealant on the screws and heads as you put them in (recently had a leak through the threads of one screw, all of which appear to have no sealant on them after a "professional" job - a worry) Sikaflex®-522 cures by reaction with atmospheric moisture. At low temperatures the water content of the air is generally lower and the curing reaction proceeds some-what slower (see diagram 1). 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. Sikaflex 522 is also suitable for the replacement of joints on both caravan marine and other vehicular construction projects. Suitable substrate materials include timber, glass, metals, metal primers and paint coatings (2-part systems), ceramic materials and plastics.

PRODUCT DATA SHEET Sikaflex®-522 - Industry | Sika PRODUCT DATA SHEET Sikaflex®-522 - Industry | Sika

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... Consider that the viscosity will increase at low temperature. For easy application, condition the adhesive at ambient temperature prior to use. Also stainless screws (e-bay, get the right length and head shape) would be useful rather than anything that may corrode? Multi purpose hybrid adhesive sealant with high weathering, ageing and mould resistance. Suitable for the sealing and bonding of various applications internally and externally in caravans and motorhomes, including skylights and aerators.Meets hygiene requirements for ventilation and air-conditioning systems and units according VDI 6022 Blatt 1:2011-07 Sikaflex 512 has now been replaced by 522 - the sealant is exactly the same but just an updated version. Sikaflex®-522 can be processed between 5 °C and 40 °C (climate and product) but changes in reactivity and application properties have to be considered. The optimum temperature for substrate and sealant is between 15 °C and 25 °C. This is a highly recommended product, ideal for installing windows and rooflights into panel van conversions Sikaflex®-522 can be processed with manual, pneumatic or electric driven piston guns as well as pump equipment. The skin time is significantly shorter in hot and humid climate.

Sikaflex 522 (White) (REPLACES SIKAFLEX 512) - Magnum Motorhomes Sikaflex 522 (White) (REPLACES SIKAFLEX 512) - Magnum Motorhomes

Uncured Sikaflex®-522 can be removed from tools and equipment with Sika® Remover-208 or another suitable solvent. Once cured, the material can only be removed mechanically. This multipurpose adhesive sealant from SikaFlex is ideal for caravan and motorhome construction and repair. It bonds to a wide variety of surfaces and is perfect for those wishing to create permanent elastic seals of high adhesive strength. Anyway, here’s my question: I’ve watched a lot of YouTube videos on removing, resealing, and replacing the railing. Americans seem to use a sealing strip when regluing the railing; us Brits seem to like to use Sikaflex 522. Hands and exposed skin have to be washed immediately using hand wipes such as Sika® Cleaner-350H cleaning towels or a suitable industrial hand cleaner and water. I always liked W4 mastic, comes on a roll in varying widths. Used it on various jobs including top rails when we had MH.Sikaflex 522 is both an adhesive and sealant making it ideal for caravan, motorhome and trailer repairs as well as DIY fitting of caravan vehicle accessories.

Sika Sikaflex EBT+ All-Weather Sealant White 300ml - Screwfix Sika Sikaflex EBT+ All-Weather Sealant White 300ml - Screwfix

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) ?