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Questions on Wood Siding Repaint For Hail Damage (reddthat.com)

submitted 2 months ago by Trainguyrom@reddthat.com to c/homeimprovement@lemmy.world

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My small garage was built in the 40s and has wood siding which was damaged by a recent hail storm. Insurance cut us a settlement check and I decided to challenge myself to repaint the garage myself

The hail mostly damaged the paint, with some small chips in a couple of spots. My plan is to sand the portions that are to be repainted, fill the chips with wood filler and repaint

I'm looking at getting an air compressor (Partly as I'm seeing commentary on it being far easier and faster than rollers, and partly out of buying a tool I might not ever have a decent enough reason to buy in the future that'll be useful to have on hand) and a sprayer to do the bulk of the painting

Given I'm mostly looking to repair some quarter size damage to the paint splottered all over 2 sides of the garage, do I need to sand all of the old paint off before repainting or can I simply paint over the old paint? The old paint is in pretty good shape where the hail didn't sand it away. Looks like its been repainted within the century, possibly even within the last decade, and I'm not changing colors dramatically, just doing a flat "white" over a flat "white" which shouldn't be a very obvious difference after weathering. Basically am I reducing the durability of the paint job if I paint over the existing undamaged matte paint?

Additionally, any other gotchas I should be aware of?

I can provide photos tomorrow of the damage and existing paint if needed

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[–] just_ducky_in_NH@lemmy.world 5 points 2 months ago

If the old paint isn’t peeling, new paint on top won’t damage it. HOWEVER, the new paint might not adhere well to the old stuff, and peel off in a year or two. In my opinion, best practice is to scrape any loose paint off, and sand the edges of the painted areas smooth. Prime the areas to be painted (it will help new paint adhere to old), then finally paint the areas with new paint.

[–] wildbus8979@sh.itjust.works 2 points 2 months ago

Before sanding, seeing the age of the building, and considering this is exterior paint. Make sure there isn't a layer of lead paint in the mix.

Don't get swabs they suck. Either get it tested by a lab, or get a methylammonium bromide based detector from detectlead.com or similar.

[–] pdavis@lemmy.world 2 points 1 month ago

I would recommend power washing to remove any peeling paint and grime. Then sand/fill/sand the necessary spots. You can safely paint over the old paint as long as the old paint's adherence to the wood is good and your new paint will stick to it. If in doubt start with a primer coat. The primer coat would probably be recommended for the patched areas anyway.