Strip and brighten all, and for the best UV protection and the most uniform appearance, use the TWP Semi-Solid. See here:/p>

Clean and brighten all wood for prep and then use a penetrating semi-transparent stain that is similar in color. Only 1 coat.

We would suggest getting it all off. For most of the stain left, we suggest the RAD stripper with both additives. Apply, let dwell for 45 minutes, and...

Please post some pics in the forum of the wood.

Newly applied stain is more challenging to remove. Use the RAD stripper with both the Booster and the Gel additives. Apply and let dwell for 30-45 min...

You are welcome!

Clean and brighten this oxidized wood for prep. 2 Coats of the solid stain.

See this for solid stain recoating tips:/p> You will need 2 coats. Might want to look at the RAD Solid Stain as well.

No semi-transparent stain will hold up any better than the TWP 100 Series when it comes to heavy foot traffic.

No stain is immune to heavy foot traffic. Eventually, you will get wear patterns. Do you prefer to see some grain or is a solid opaque appearance okay...

Yes, it needs to be applied wet on wet. You can walk on the first coat but you have to take care to not leave footprints or step in your second coat.

How did you prep? Looks like you stepped in the first coat before it had any chance to set. It could be due to it being a covered porch as it can take...

The only way to fix this is to remove all and start over with bare wood. BTW, you have an exotic hardwood deck. You need a stain designed for this woo...

Wherever you still have any old stain/shiny coating will need to be removed. Let the stripper sit longer, it will come up better.

Yes, you need to remove all old coatings that is still on there. When you say "varnish" are you using RAD Dark Walnut? It is not a varnish, but a pene...