BlueStringPudding

Doesn't Fertan have to be washed off? If so, using it on extensive roof rust will mean that washing it off causes the acid to run down the paintwork and windows too, doesn't it? Admittedly without the vinyl type coating, but would that acid not also damage the paintwork or window frames? Or is there a knack with Fertan to prevent that from happening?

Lol. Been using that bottle for YEARS! 😃😃😃 Had no idea Vactan has an eat-by date. Well, I've learned that the (very) hard way.

Sunny (not hot) and not particularly breezy. It sounds like what you describe is probably what happened, though. Possibly.

So, here's a question: how do I prevent this from happening again when I de-rust the rest of the boat? I'm not sure what I did wrong. Like I said, when I left it about 4 or 5pm yesterday, the Vactan was already dry and clear (no longer off-white colour), little of the rust had yet turned blue-black though, and there were no dribbles at all. By this morning: Title scene from a horror film. I can't leave the remaining rust untreated forever (as tempting as that may be) So what can I do differently next time? 🤔

I've not applied Vactan to the red or cream painted areas, only the blue. Any horizontal streaks in the cream would be accidental from the edge of the brush. The vertical streaks are coming from the blue above, trickling down over the cream and red, which haven't bled. ----- I mentioned to Tree Monkey yesterday that I thought it was strange that the Vactan hadn't turned all the roof rust a blue-blackish colour. Much of it remained brown last night, even though the Vactan had dried. I thought maybe it was because it's an old bottle of Vactan, it had possibly lost some of its potency. But this morning, all the roof rust has been converted to blue-black. So I suppose while that happened overnight, it produced all this horrid juice that's run down everything and dried on it. Maybe with the addition of rain or dew. Who knows? It looks a feckin sight, though. 😕

I think you might be right I've now tried a sponge scourer with Ecover spray on one area of the red/cream paint. And on another area, a Swarfega-like gritty-textured handwipe. But no joy with either. Some of the blue colour comes off onto the handwipe but the red/cream paint looks equally stained underneath. The roughness of the wipe at least got the blue stripes off the window glass! I had resorted to using my thumbnail to scratch them off, but it was knackering. 😃 Any thoughts on whether it's possible to get the marks off the silver coloured window frames? If So, what with?

I've used Vactan for years, it's always been straightforward. Yesterday, having spent several days sanding down a 6-10 inch strip of roof (many layers of blue antislip paint), plus the handrail above it, and the blue frame around the the boat sides, I applied Vactan. (There had been a LOT of rust, especially on the roof). The Vactan went on the same as it always does. A few hours later when I went back indoors, the Vactan was dry and everything looked normal. However... This morning I came outside to find all my red and cream paintwork, and even the window frames stained with dirty blueish streaks. I've given it a scrub with a wet broom, but it doesn't come off. It's totally b*ggered. And I'm rather upset about it. This is about 25ft of cabin side. 😲 Any ideas why this might have happened? I've never had Vactan run like this before, and certainly not hours after drying. I would like to avoid this happening again coz there's plenty more rust to tackle. Also, if anyone has any tried and tested methods of how to safely remove the blue streaks from my red paintwork and signwriting, that would be great. I've got a horrible feeling it's permanently fooked 😕

Rubber tap scrotum is my new favourite phrase. I hope to be able to use it in everyday conversation 😃

That's brilliant 👏👏😃

I remember being told by a chef never to eat food from a place with a hygiene rating of less than three. He reckoned that any idiot could achieve a 3, as long as they didn't serve the food off the toilet the floor. 😉 Here's the rating of The Swan: https://ratings.food.gov.uk/business/en-GB/1281054/The-Swan-Inn-Burton-Upon-Trent