Although I don’t post much (I’m able to solve most of my problems by searching) I ran into some difficulty while doing some paint prep today.
We have an upper-high end rental at least for this rural area) that we are planning on spiffing up and selling in a few months, after out long term (10+ year) tenant moves out. One of the things on my to-do list is exterior paint (something I’ve done numerious times, so I have an idea what im doing), which is where my question comes in. Due to some reccomendations from here and instructions off the back of the TSP box, I mixed up a solution of 3quarts of water, a cup of TSP, and a quart of bleach. Sprayed, scrubbed, then let it sit for maybe 20minutes. Went back and hosed it off, and all was well. I moved on spraying more, in the same fashion.
However, when I glanced back at my already rinsed wall, it had once again turned a nasty bleach yellow. So I go back and hose it down again, only for it to reappear in about 20 minutes. Did this a number of times assuming it would stop coming back, but it sure didn’t. Only did this for about an hour or so before it got dark and I had to pack up.
So is this even a problem, or when I go out tomorrow will it wash off and stay away? I should mention the siding type- but I really can’t as I don’t know the name of the stuff (whew I feel stupid 🙁 ) It’s 12″, some sort of a pressed composite paper material with an embossed fake wood grain. House is from mid-late 80’s. If it matters/helps, I’d be able to snap up a picture.
Thanks for your time
-Jeff
Replies
Don't know what causes it Jeff, but a strong bleach solution will do this to bare wood. It's happened to me plenty. Why? no idea..I used to be a chemist and it boggles me.. But you'll need to sand it off or paint over it. It's friggin' permanent.
I was spotpriming old clapboards with white Glidden Gripper and could see where the primer went over the edge of the old paint and it would yellow, but the bare wood stayed white.
No bleach involved. What's with that. Topcoat went on fine.
sleeps till noon but before it's dark...
Not that it will help with your current situation, but...
Jasco makes a "No-Rinse" liquid TSP. Seems to work well. I hate preping for paint, so anything that makes it easier gets my attention!
That's pretty strong bleach. It yellowed the existing paint. Should be fine to paint over, though.
Alright everybody, thanks for the help. Just wanted to make sure I could run my primer over it, as I didn't want to do all this prep if it was doing more harm than good :)
BTW, that's hardboard siding, sometimes referred to as Masonite, though odds are what you have is a different brand.
it's masonite, and is great if it never got wet or was in an area with more than 1% humidity. it's only saving grace is that termites like it better than wood, so they leave the structure alone. i have a house full of that crap, and when the termites finish removing it for me, i will go back with hardie plank. yeah, you hit a nerve.
By description and time frame, the siding sounds like Masonite which has had it's own seeries of problems so should be painted well anyway, if it is still sound. If not, there was a class action lawsuit but I don't know the outcome or if any money would still be left.
The mixture you used sounds very strong to me, and Chlorine sometimes reacts with other chemicals to leave a yellow stain. I would sand lightly and repaint, staarting with an exterior primer/sealer.
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