This calculator will help you determine the proper amount of stain and prepping supplies needed to refinish your deck using TWP 100 or TWP 1500 Series.

 

This calculator is intended to provide you with an approximate estimate only. Material requirements may vary according to application method, surface condition and weather conditions.

 

You will get two prepping results. You need one, not both options:

  • First will offer the Gemini Restore Kit. This will be used for new, gray, dirty decks and for applying TWP over an intact older coating of TWP.
  • Second is the Restore-A-Deck Stripper and Restore-A-Deck Brightener. This is used for removing old coatings of stain. Use this if you are switching from a different brand to TWP or if you have a neglected coating of TWP that has failed unevenly.

 

If you have questions as to which to use, please ask below.

 

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  • We will reply to your comment shortly
    Anna Huisman · 10/07/2015
    July 2014 our large deck was cleaned brightened and two coats of TWP 1500 clear was applied. Deck has some mildew and algae but in general still looks pretty good. Can I wait till next early spring or should I redo same procedure this fall(2015). We;re living in North Virginia. If I would go ahead redoing can I only do one coat to seal or do you always need to apply two coats ( wet on wet)? Thank you.
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    TWP Stains · 09/23/2015
    william merchant:
    hello I have just bought 5 gallons of your 1500 series stain and I was wondering the day time temperature is good about 78 to 80 degrees but the night are getting cool, which means that there is due on the deck in the mornings will that effect the stain from curing(drying)should I wait until early summer to stain my deck thank you for the input! William merchant

    It should not affect the stain so go ahead and apply this Fall.
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    william merchant · 09/23/2015
    hello I have just bought 5 gallons of your 1500 series stain and I was wondering the day time temperature is good about 78 to 80 degrees but the night are getting cool, which means that there is due on the deck in the mornings will that effect the stain from curing(drying)should I wait until early summer to stain my deck thank you for the input! William merchant
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    TWP Stains · 09/21/2015
    Donna123:
    Hi we have a pressure treated pine deck that we had built 3 summers ago and have never stained it or put any product on it. It is in good shape, just looks real light colored now (almost white looking). I was planning on using one of your cleaners first and then using the 1500 stain. What cleaner and steps would you recommend? The deck is 9x30 (full sun) and attached to a smaller enclosed 7.5x21 deck (screened in porch). I estimated with steps, a total of 488 sq feet using your calculator with the amount of steps I have. I read in your blog too, that it may take more stain with a dry and untreated deck. Thanks for any help!

    Use the Gemini Restore Kit and pressure washing for the prep and cleaning. You will need about 4-5 gallons for 2 coats.
  • We will reply to your comment shortly
    Donna123 · 09/21/2015
    Hi we have a pressure treated pine deck that we had built 3 summers ago and have never stained it or put any product on it. It is in good shape, just looks real light colored now (almost white looking). I was planning on using one of your cleaners first and then using the 1500 stain. What cleaner and steps would you recommend? The deck is 9x30 (full sun) and attached to a smaller enclosed 7.5x21 deck (screened in porch). I estimated with steps, a total of 488 sq feet using your calculator with the amount of steps I have. I read in your blog too, that it may take more stain with a dry and untreated deck. Thanks for any help!
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    TWP Stains · 09/14/2015
    Bill Strickland:
    I pressure washed all three decks.
    total, flat deck area = 1053 sq. ft.
    i have one, flat seating bench = 162 sq. ft.
    railing is minimal for two stair entry points with four steps, each.
    Do I really need restore-a-deck brightener? The old stain is embedded into the wood pretty deep. I will pick the redwood color=same existing color.
    I live in 46031 zip code. Any nearby dealers?

    If using the same TWP stain as before then no you do not need to use the brightener. If you are switching to TWP then you have to remove the previous coating by stripping/sanding with pressure washing. Brighten all when done. Can you advise as to which scenario is correct so we can recommend the proper materials needed?
  • We will reply to your comment shortly
    Bill Strickland · 09/13/2015
    I pressure washed all three decks.
    total, flat deck area = 1053 sq. ft.
    i have one, flat seating bench = 162 sq. ft.
    railing is minimal for two stair entry points with four steps, each.
    Do I really need restore-a-deck brightener? The old stain is embedded into the wood pretty deep. I will pick the redwood color=same existing color.
    I live in 46031 zip code. Any nearby dealers?
  • We will reply to your comment shortly
    TWP Stains · 09/11/2015
    Rube Junes:
    1. How do you calculate amount of stain needed for application to log home after corn blasting removal of existing stain product (approx 2,000 square feet of log surface including deck area)?

    2. Is one coat of stain sufficient or is two recommended?

    Two coats applied wet on wet is best. You will need 15-20 gallons for the 2000 sq. feet.
  • We will reply to your comment shortly
    Rube Junes · 09/11/2015
    1. How do you calculate amount of stain needed for application to log home after corn blasting removal of existing stain product (approx 2,000 square feet of log surface including deck area)?

    2. Is one coat of stain sufficient or is two recommended?
  • We will reply to your comment shortly
    TWP Stains · 09/10/2015
    Bruce Berryman:
    We live in northern VT (long, cold, snowy winters). I installed new siding of rough cut cedar 10-12 years ago on house and garage, including a cedar entrance gate (total: 3300 sq. ft.). When I did it, I immediately put on one coat of wood preservative from the local hardware store. Of course by now it is in pretty poor shape (dirt, mildew, brittle, discolored dark gray, etc.). I want to cover it in clear stain now (using a sprayer). I assume I need to clean it, whiten it, and stain it (with two coats of stain?). Right? Which of your products do you recommend and how much of each? Thanks!

    Do you still have old stain left on the siding? If so you will need the Restore A Deck Stripper and pressure washing to prep. Use the brightener after to neutralize. 4-5 of each. If there is not any old stain on the wood then prep with the Gemini Restore A Deck kit. You will need about 4-5 kits for this.

    Use the TWP 1500 Series for the stain and apply two light coats with the "wet on wet" application. You will need about 25-35 gallons for two coats and 3300 sq. feet of wood to cover.
  • We will reply to your comment shortly
    Bruce Berryman · 09/09/2015
    We live in northern VT (long, cold, snowy winters). I installed new siding of rough cut cedar 10-12 years ago on house and garage, including a cedar entrance gate (total: 3300 sq. ft.). When I did it, I immediately put on one coat of wood preservative from the local hardware store. Of course by now it is in pretty poor shape (dirt, mildew, brittle, discolored dark gray, etc.). I want to cover it in clear stain now (using a sprayer). I assume I need to clean it, whiten it, and stain it (with two coats of stain?). Right? Which of your products do you recommend and how much of each? Thanks!
  • We will reply to your comment shortly
    TWP Stains · 09/09/2015
    Ernest Covington:
    How much TWP 1500 needed for 888 sq. ft.(74 linear foot of 6 foot pickets, both sides) of untreated cedar fence?

    Fence installed 5/2013

    Denver, Colorado weather

    For two coats applied "wet on wet" you will need between 7-9 gallons.
  • We will reply to your comment shortly
    Ernest Covington · 09/08/2015
    How much TWP 1500 needed for 888 sq. ft.(74 linear foot of 6 foot pickets, both sides) of untreated cedar fence?

    Fence installed 5/2013

    Denver, Colorado weather
  • We will reply to your comment shortly
    TWP Stains · 09/06/2015
    Rob C.:
    I HAVE AN OLDER REDWOOD DECK..last stained with Cabot redwood decking stain 5 yrs. ago. Would like to use TWP 1500 (redwood)this time... please advise on prepping, etc.

    You will need to remove the Cabot stain first. How depends on the type of Cabot that it is. Do you know if it is a solid or semi-transaparent? If semi-transparent then you should use the Restore A Deck Stain Stripper and pressure washer to remove. Follow this with the Restore A Deck Brightener.
  • We will reply to your comment shortly
    Rob C. · 09/05/2015
    I HAVE AN OLDER REDWOOD DECK..last stained with Cabot redwood decking stain 5 yrs. ago. Would like to use TWP 1500 (redwood)this time... please advise on prepping, etc.
  • We will reply to your comment shortly
    TWP Stains · 09/04/2015
    eaerhard:
    I have a new treated wood deck, the last section has about 3 months of very dry weather and 8-10 hours of full sun exposure dry time on it. The rest has been 4-12 months of dry time. I am using the Restore-a-Deck 2 step kit to prep for stain but not sure on the amount of stain to buy to cover the 375-400 sq ft. I used the calculator but not sure if that is providing 2 coat coverage or one for a new deck as you recommend elsewhere on your site. Can you give me a better idea of how much to purchase for the initial staining?

    2-3 gallons will cover for the first coat on the deck.
  • We will reply to your comment shortly
    Eric Erhard · 09/03/2015
    I have a new treated wood deck, the last section has about 3 months of very dry weather and 8-10 hours of full sun exposure dry time on it. The rest has been 4-12 months of dry time. I am using the Restore-a-Deck 2 step kit to prep for stain but not sure on the amount of stain to buy to cover the 375-400 sq ft. I used the calculator but not sure if that is providing 2 coat coverage or one for a new deck as you recommend elsewhere on your site. Can you give me a better idea of how much to purchase for the initial staining?
  • We will reply to your comment shortly
    TWP Stains · 09/02/2015
    kmf:
    HI
    we are replacing t&g mahogany decking boards that have rotted out then refinishing remaining decking.
    would like to sand off spar finish and apply 1500 series to entire porch deck.
    porch id covered 600 sqft.
    please advise regards Kevin

    You would need about 5 gallons for 2 coats of the TWP. If you only do one coat then you would about 3-4 gallons.
  • We will reply to your comment shortly
    kmf · 09/02/2015
    HI
    we are replacing t&g mahogany decking boards that have rotted out then refinishing remaining decking.
    would like to sand off spar finish and apply 1500 series to entire porch deck.
    porch id covered 600 sqft.
    please advise regards Kevin
  • We will reply to your comment shortly
    TWP Stains · 08/30/2015
    mike gumbinger:
    I have a deck that is just 5 months old and it is recommended to just put one coat one after I clean it. How long will the 1501 last if I purchase 5 gallons?

    http://www.twpstainhelp.com/shelf-life-of-twp/