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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    Bobby · 11/02/2021
    Do you have a suggestion on the best type of sprayer to use to apply the stain?  Thank you!
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    Brandon Dove · 10/06/2021
    Do you have a calculator for exterior of log cabins?
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      TWP Stains · 10/07/2021
      Just do not use the railing portion in above and use the length and height of the siding for the floor.
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    pat · 10/01/2021
    twp 115 - is it available or did it change to 1500
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    Keith Merwin · 09/09/2021
    Question: My deck is two years old.  Pine treated. NEVER stained or painted. Some planks already have algae and UV damage, mill glaze and brown stuff oozing out of knots (see pics). In my particular case and to use TWP 100 semi transparent, oil based stain, do I need cleaner and brightner for prep?
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      TWP Stains · 09/09/2021
      Yes, that is correct for prep. 100 or 1500 Series.
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        Keith Merwin · 09/09/2021
        1) Difference between 100 and 1500 series? One semi transparent and one solid?  Both oil based?
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          TWP Stains · 09/09/2021
          Difference is what is allowed in your state based on VOCs. Both are oil based and semi transparent. 
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    Bobby · 08/13/2021
    I have a new 6’ pressure treated fence that is about 200 linear feet long.  Assuming the calculator is correct I will need about 10 gallons.  What should I use to prepare the fence before staining and should I wait a certain period of time between preparation and staining?  Also - can I use a sprayer to apply to stain?  Thanks!!
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      TWP Stains · 08/14/2021
      If you are doing both sides of your fence, you will have 2400 sq feet to cover and you will need 20-25 gallons for two coats. If the wood is rough sawn wood, you can stain it now with two coats applied wet on wet. If smooth wood, you will need to weather, then prep, and only apply one coat. See tips here: https://www.twpstainhelp.com/prepping-new-wood-for-twp-stains/
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        Bobby · 08/14/2021
        Thanks for that.  I think the 6’ pickets would not need prep then.  However there are 2x4 on top (typical 2x4’s found at store).  Are these classified as “smooth”?  Also can you tell me if applying via a sprayer is OK or will I waste a lot?
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          TWP Stains · 08/15/2021
          You can spray and yes, it does have some waste from overspray. You should be fine to stain now.
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    Brenda · 07/29/2021
    If we currently have Behr restore a deck, can we put a semi solid  or solid over it?
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      TWP Stains · 07/29/2021
      I assume you mean Behr Deckover as there Is no such thing as Behr restore a deck? This will have to be 100% sanded off before you can use any of the TWP Stains.
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    WDB · 06/30/2021
    Hello when calculating the size of my deck (791 sq ft of surface area) it says I will need 2 cleaner/brightener kits or 2 "jars" of stripper and 2 "jars" of brightener.  But the site also says that 1 cleaner/brightener kit will do 750-1000 sq ft and the same for the stripper and brightener.  Just wondering why the calculator says I will need 2 kits and what "jars" it's referring to with regard to the stripper?  Thanks
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      TWP Stains · 06/30/2021
      It averages at 750 per kit. It can go up to 1000 sq feet if an easy clean and or strip. It also can do down as low as 500 sq feet for difficult jobs. Since the average is 750, anything over is rounded up.
      There is no way to be 100% accurate as coverage always varies based on the wood condition, age of the wood, type of wood, etc.
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    Dan Reed · 06/02/2021
    Hi, I am restoring my deck and trying to stay close to the same semi transparent stain color which was a cedar tone. It was applied about 20 years ago originally. Was redone once about 15 years ago. I've sent pictures of what the current color looks like on surfaces that haven't faded badly. Can you recommend which stain color I should use. The Cedar color almost looks to light but I know it's hard to tell with pictures. Should I stay with that or go to something like the redwood? 

    All of the horizontal deck boards and hand rails have been sanded smooth and stripped of old stain. A lot of the vertical sections have been roughed up but not stripped completely(like the balusters and posts). Total square footage has calculated to 817' using your calculator. Based on everything I've read I should be ordering 9 gallons of stain (I will order 2-5 gallon cans). It also says I should use 2 jars each of the Restore-A-Deck Stripper and Brightener. Since I've completely stripped 500 sq ft of deck and 102' of hand rail, do I need as much stripper and brightener?  Any other tips I should know about? Thanks, Dan - Mableton, GA
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      TWP Stains · 06/02/2021
      Hi Dan,
      Look at using Pecan color for this. Not sure on the stripper needed. Probably one Stripper/Brighener kit will work.
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        Dan Reed · 06/02/2021
        Do you think I should use 100 or the PRO?
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          TWP Stains · 06/02/2021
          Pecan comes in the 100 Series or the 1500 Series. Either is fine.
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    Michael H. · 05/29/2021
    How do I remove opaque stain to get down to natural wood surface?
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      TWP Stains · 05/30/2021
      Sand it off. Strippers will not remove solid stains fully.
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    VT Biker · 05/19/2021
    1 or old PT, southern exposure in northeast. Looks great, minimal discoloration Must I cleaned prior to applying Cedar penetrating product?
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    C Alger · 05/15/2021
    How much will a gallon of TWP 103 pro series  dark oak cover when staining a previously stained rough sawn cedar fence? ( 6 feet tall board on board) 
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      TWP Stains · 05/16/2021
      You will need to remove the current stain unless it is TWP on there now. Coverage is about 150-200 sq feet per gallon.
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    Shawn Paskevic · 05/09/2021
    We have a new (12+ months) deck with 550 sq ft. plus  5 steps that are 5 ft wide.   We want to do Thunderbolt semi-solid.  And based on reading the blogs and comments, we need to prep the wood.    We bought samples.  How much stain and Gemini prep do we need and what do we use as promo code for discount for samples we bought?
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    Shawn Blaquiere · 04/25/2021
    I live in Salmon Arm, BC, Canada.
    How much TWP 200 would I need to refinish my 1000sq ft deck.  Do you recommend 2 coats?  How long will it take to get the product delivered?Thank you,SB
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      TWP Stains · 04/25/2021
      One coat should be okay with the 200 Series unless the wood is very dried out. About 5-7 gallons. Shipping to BC takes about 3-7 days.
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    Brian Connolly · 04/17/2021
    We live in Mid-Michigan and have 14x14 deck with spindles, steps and railings that is 4 years old, never been stained, with full sun and a swing set we’d like to match. Swing set was stained, just starting to look weathered. I’ll do the calculator for the deck but I’m unsure as to how to go about estimating for the swing set. Please advise on that as well as best bet for longevity in a stain. Thanks!
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      TWP Stains · 04/17/2021
      For prep on the deck, use the Gemini Restore Kit. For prep on swing set, you will need to remove the current stain by stripping and or sanding. You would have to measure all the wood to be stained for the swing set to determine amount needed. For this deck and play set, look at the TWP 100 Series.
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    Susan M · 04/15/2021
    I used TPW 100 in 2019 on my deck. It looks good except in a few high traffic areas where it looks almost down to wood. What are the steps I need to do to reapply? I am confused by the need to strip again or just clean and go. I really do not want to have to resend. 
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    Dave · 04/09/2021
    Why would you need the Gemini Restore Kit for new wood/first time coating?  This will be for a new cedar fence using TWP-1530.
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    Elizabeth · 04/04/2021
    I have a 2.5 yr old, 20' x 22' deck made of pressure treated wood. Southern exposure in mid-Atlantic state. It has never been treated. Other than discoloration and some very minor warping it is in great shape. Not sure what advice to follow on website since it's not "new wood" but it doesn't need stripping of of a previous product.
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    Debbie · 03/29/2021
    3/19/21
    We live in Houston, Texas and about a year and a half ago used TWP 101 Cedartone Natural on our treated pine deck that is partly shaded and part in full sun. The shaded area still looks great, but the sun exposed area is beginning to look dry and weathered--clearly it is now time to redo.
    Questions:
    1. Would there be an advantage to use your new product--Semi Solid Stain rather than the Series 100 since wood takes a beating in the Houston heat and sun? Would it be more durable?
    2. If so--hopefully--we wouldn't have to strip, just power wash, clean/brighten--is that correct????
    3. What would we do about the shaded area that still looks good? This area runs continuous with the area that is exposed to sun?
    4. Also with this new product--is it recommended to do the wet on wet application or will we even need to do a second coat since we originally used your product?
    5. What color of the Semi Solid Stain most closely matches Cedartone Natural?
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      TWP Stains · 03/29/2021
      1. The semi-solid would give better protection.
      2. Strip and brighten if you switch.
      3. Strip and brighten all.
      4. Starting from scratch now.
      5. Any color you like will work, none will match the 101 Cedartone. Close would be Super Cedar, ect.
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        Debbie Walker · 03/29/2021
        Ohhh not what I wanted to hear! Very tempting not to change products as the beauty of originally switching to TWP was so we could easily and simply reapply without starting over! With that said and we decide stay with TWP 101?
        1. What would be the order of our prep steps
        2. Should we just reapply over the shaded area that still looks good since there is no obvious stopping point between the sunny and shaded portions?
        3. Will we still do wet on wet application or just one coat?
        This forum is so helpful--thank you very much!
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          TWP Stains · 03/30/2021
          1. Gemini Restore Kit
          2. No, do all.
          3. Most likely wet on wet coat.
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    Rick · 03/28/2021
    I have used twp stain about 3 years ago and ready to do it again. I have about 1400 sq ft of existing redwood previously stained wood with the TWP 15000 California Redwood and 400 feet of new fencing. How much product do I need?
    thanks

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      TWP Stains · 03/29/2021
      About 15-20 gallons for two coats. Make sure to prep correctly first.