Removing the Damaged Stain
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Apply a layer of stain and sealant stripping chemical to the bubbled area. Use a scraper to peel the layer of stain from the wood. Wipe the surface with a wet rag.
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Spray on a wood brightening agent. This will bring back the natural wood coloring and prepare the surface to accept a new layer of stain.
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Rinse the area(s) well with clear water from a garden hose. Allow the wood deck 12 to 18 hours to completely dry.
Restaining the Area
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Lightly sand the areas on the deck that the brightening agent raises on the wood. Do not oversand, though, or the stain will have a hard time soaking into the wood.
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Mix the stain carefully. Avoid shaking the can, as it will create bubbles to form in the product.
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Use a small brush to apply the stain. Take plenty of time and go slowly during this step. Applying stain too quickly causes bubbles to appear on the surface.
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Wait a few minutes and apply a second layer for color matching, if needed. Give the deck 24 hours to dry before replacing any furniture or allowing foot traffic on it.