Sunday, Oct 19, 2014 at 22:21
Silicone has no place on a caravan (or anywhere else in my opinion) so the first thing you need to do is remove it all, and it isn't easy to do. A plastic scraper and mineral turps is a good start, then a rag & more turps when the bulk of it has been scraped off, until it is all gone.
The product you want to use then is Sika-Lastomer 511-16 (part number 80270)
It is a mastic type material that never goes hard, but will skin over where exposed to atmosphere, and once skinned can and should be painted over. It is very easy to use, and excess cleans off with turps, even days later.
Although it is primarily for use between two strata, it can be used as a bead over the outside of an existing overlap joint etc. but should be painted over if used that way, but having said that, it will last for many many years without paint. If you use this product correctly, you will never have it leak, and will never need to be re-caulked,
well, not in your lifetime anyway.
Cheers, Phill.
(P.S. I used to work on a caravan production line)
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