It will be interesting to see how long my Sika lasts.
I went to an Altex painting evening on Thursday. A really interesting lady from Altex spoke all about their new roll on two pot paint
She told us about contamination. A paint
shop can be scrupulous in prep, wash and then wipe down with solvent etc. Spend ages sanding
and everything. Then go to lunch. While they are at lunch a courier van backs into the workshop to deliver a package. Just a small amount of diesel
fume goes into the workshop. Later the paint fails.
She gave us a demonstration of the paint after the talk. She had some primed panels
and let anyone roll the paint on and layer it with a brush. She mentioned that when she was preparing the panels
forklift went past one. Sure enough when this panel was painted a big circle appeared on the panel, not unlike a bacteria shaped balloon. All the other panels were fine. This one was contaminated.
She said that 1 part per million silicon will stuff a paint job. If you are painting outside and someone is using a silicon polish a few boats away it could be all it takes to stuff it.
I am sure Sika is the same. Humidity, prep, sunlight, wrong solvent to clean surface, all sorts of variables can probably stuff a good job. Even breathing on the perspex before you apply the sika could probably cause a failure. I know with other silicon based products this can stuff the job. Certainly does when glueing a dingy patch.