After taking the best advice last March, (*FUNSTERS*), I bought a new Heki rooflight for our old Hymer. The original 'pop up' model was getting really old, very discoloured, and frankly, brittle.
All went according to plan, and the Heki became part and parcel of the truck, (following a nervous period checking for leaks). No problems at all until November, when I noticed a .....'dreaded drip'. Didn't amount to much, but with the winter in full swing, I dropped the truck off for repair with Stewart Morley of Pilling, Lancashire.
He repaired, and reported thus:- My fitting had been fine, roof prepared properly, and the correct sealant used, Sykaflex 512. However, Stewart found that the Sykaflex had not taken to the roof light, because, (it seems), I had neglected to clean off the brand new unit with meths. When these plastic units are manufactured, they are sprayed with a silicon release agent, so they don't stick to the mould. This had stopped my sealant from adhering to the Heki, and completing a good bond, resulting in eventual water 'creep' over the plastic lip. A big job for a small oversight.
All went according to plan, and the Heki became part and parcel of the truck, (following a nervous period checking for leaks). No problems at all until November, when I noticed a .....'dreaded drip'. Didn't amount to much, but with the winter in full swing, I dropped the truck off for repair with Stewart Morley of Pilling, Lancashire.
He repaired, and reported thus:- My fitting had been fine, roof prepared properly, and the correct sealant used, Sykaflex 512. However, Stewart found that the Sykaflex had not taken to the roof light, because, (it seems), I had neglected to clean off the brand new unit with meths. When these plastic units are manufactured, they are sprayed with a silicon release agent, so they don't stick to the mould. This had stopped my sealant from adhering to the Heki, and completing a good bond, resulting in eventual water 'creep' over the plastic lip. A big job for a small oversight.