[RPetry]

Kirk,

ACR Products unfortunately named their products where it gets confusing. ACR Booster is actually a foaming agent. When added to an NaOH stripper, it thickens it somewhat and keeps the stripper wet longer.

Their 633ADD is the additive that actually makes the NaOH stripper stronger, or "boosts" the mix. On this job, we used both in conjunction with ACR 760 NaOH stripper, which is very similar to Bob's F-18.

On this job, we used 8 oz. / gal. of all three products mixed together. Let dwell for 15 - 20 minutes and pressure wash rinsed. Only one stripping on this job removed most of the old acrylic top coat and oil stain underneath. The floor did not "fir" up but there were maybe 10 or so spots that needed spot sanding to remove patches of old acrylic stain.

The vertical balustrade wood took more prep work. It does and did "fir" to a much greater degree than the deck floor, which is usual for cedar. In this case we quickly sanded the spindles/fascia with random orbital sanders, and used a Makita with 3M defelting pads on the 2 inside surfaces of the spindles.

Hope this helps.