It's a 2019 coachman pistache. I've noticed the sealant that runs the length of the join has lifted from the roof. I'm guessing all the sealant in the join where they are bonded together will be fine, it's just the outer line of sealant that you see.
What's the best way to reseal? And what with?
Cheers.
Just going to post this here for reference. Not sure how good the advice is but it's pretty hard to find the right sealant for the job.
I'm still not sure. Was going to go with 522 but wondering if it could set a little too hard. Seems my roof is a floating aluminium one that really ripples in the heat, I'm wondering if a more stretchy sealant would be better.
This might be of interest, it was sent to me by someone who found it on a different forum.
Always remember, where appropriate adhesives can be used to seal but NEVER use sealants to bond
Polyurethanes - Note: these adhesives are not great with UV stability so you will find white products exposed to sunlight may yellow in time.
Sikaflex 252 (adhesive) - The one most of you may have heard of. Used in conjunction with primers for bonding to many materials used in the make up of caravans.
Sikaflex 221 (sealant) - Again a popular (older) product used for sealing only and best used with primers. Also good for most materials.
Hybrid Adhesives (Known as Silane Terminated Polymers) - More modern and used in most caravan builds today. UV stable so can be used externally as well as internally.
Sikaflex 552 (adhesive) Can be used on most substrates sometimes without priming. Will bond most windows / vents / solar panels.
Sikaflex 521UV (sealant) Can be used to seal almost every joint on a caravan including external joints. Can be used around mechanically fixed items to ensure seal against water ingress if drilling or fixing into the body.
Sikaflex 512 Caravan (sealant) Similar to the 521UV product but has additional Biocides. In Laymons terms it has recently been reformulated to increase its mould resistance.
Butyl Sealants
Sikalastomer 710 (Butyl sealant) - Can be used as a sealant for parts that will subsequently need to be serviced and/or replaced.
Surface coatings, paint finishes Preliminary trials are necessary before attempting to bond substrates with an applied surface coating. As a general rule, reactive systems that cure thermally (cataphoretic immersion coatings, powder coatings) or by addition of polymerisation (epoxy or polyurethane paints) can usually be successfully bonded with Sikaflex® and SikaTack® products. Alkyd resin paints that dry by oxidation are not suitable for bonding. Paint systems that rely on a physical cure mechanism – typically coatings based on polyvinyl butyral or epoxy resin esters – are generally compatible with sealants only, i.e. not with adhesives. Caution: The presence of paint additives designed to modify film formation, such as conditioners, silicones, matting agents, etc., may adversely affect adhesion to the paint surface. Consider that certain coatings can be negatively influenced by wheatering, for example if exposed during transport prior the bonding and sealing process. Surface coatings must be monitored for consistency of quality and uniformity of composition through a quality assurance system
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Topic: Sealant on roof lifting
via mobile 09/5/2025 at 8:47am
