LJ Virgin seeking advice re sanding while refinishing small mahogany porch

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Forum topic by Southcoastphil posted 05-11-2017 11:31 PM 494 views 0 times favorited 0 replies Add to Favorites Watch
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05-11-2017 11:31 PM

Yes, I’m a LJ virgin, so please be gentle with me!

(Note to moderators: Since I’m new, please feel free to move this to a different forum.)

I did a search, but didn’t find the results I sought.

A customer has a small (~70 sf) mahogany porch that hadn’t been cleaned in at least the five years since she and her husband bought their house in SE MA. Porch is on the N side of the house, so lots of mold/algae on it, but under the slime, the deck boards are in perfect condition. No cups, no checks, no cracks, no popped or loose nails or screws. About 1/8” space between the deck boards (16” OC) with no debris in the spaces.

First i cleaned it with sodium perchlorate (wet the porch first, applied with a a soft-bristled brush, scrubbed with a stiff brush, kept it damp, scrubbed again after 15 min and rinsed off). I also tested a small area with brightener (oxalic acid) after rinsing off the cleaner and that piece looked great.

I went back a day later to test for water absorption and found that water still sat on the surface of the boards (didn’t bead up, but didn’t soak in), so I applied a Penofin deck stripper (Can’t say that I’m a fan of their stains, based on my first-hand results, but the stripper is pretty good.) onto a damp deck, scrubbed, kept it damp for 15 min or so then rinsed it off.

Problem is that some of the boards still have water sitting on the surface. I really don’t want to PW that gorgeous wood (even at low pressure and 15* angle), so can i hit it lightly with 120 grit in my ROS? I’d then go through the proper steps of cleaning and brightening/neutralizing with oxalic acid.

Many thanks in advance for your help, gents!

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