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TWP 100 VS TWP 1500

They are both leading oil-based wood preservative formulas manufactured by Gemini / Amteco Coatings and distributed by the online dealer

The main difference between the two products is in the formulations but both are premium wood staining products.

Is wood staining essential?

Wood is one the most available and renewable resources for many uses building and construction being one of them.

It makes for excellent designs that exude warmth, simplicity, and a natural aura. It is, however, an organic compound that makes it susceptible to damage from molds, algae, water, heat, light exposure, and pests. 

Wood is a versatile building material and many items big and small are constructed from wood.

All these will eventually come into contact with air, water, heat, and chemicals throughout their life span.

Without any added protection, natural degradation, decay, rot, discoloration, warping, cracking, and breakage will occur rendering your wooden furniture unusable requiring replacement.

Wood staining is essential to prevent this. Done properly, wood items last decades.

Stained wood is also considerably more aesthetically pleasing than bare wood.

A significant factor in selecting a staining agent is the color that the agent eventually renders on the wood, and whether it provides the desired aesthetic quality.

TWP 100 vs TWP 1500

TWP 100 is the original wood preservative brand in the series and has been a leading formula for well over 25 years.

It was however restricted for use in some states necessitating improvements with regard to its chemical composition.

TWP 1500 is the latest entrant in the series which was formulated to improve on the previous formulas and address safety concerns. It is currently available in every state.

VOC Levels

VOC or Volatile Organic Compounds are organic compounds that have high pressure in their vaporous form at room temperature.

Most VOCs are found naturally in the environment since they are produced by animals and plants as part of their physiology.

Anthropogenic VOCs on the other hand are created and dissipated by human activity such as in the making and use of synthetic products and chemicals like wood preservatives. 

In the short term, they do not appear to affect health and the effects on humans and the environment are still being investigated but in the long term, they have been found to cause or accelerate health problems and do considerable damage to the environment.

TWP 100 has a VOC concentration of about 550 grams/liter which is deemed very high. TWP 1500 has a VOC saturation of 350 grams/liter, which is acceptable in most states.

Availability in the Different States…

Each state determines the safety levels of certain chemical products. A number of states have stringent VOC level restrictions preventing the distribution of chemicals that exceed specific levels.

Though both TWP 100 and TWP 1500 are in production and are registered with the Environmental Protection Agency (EPA), TWP 100 is not approved for distribution in 36 states due to its high VOC levels that fall outside the approved limits.

TWP 1500 is approved and available in all fifty states.

Improved Formulation.

Though TWP 100 is an excellent wood preservative, and both offer outstanding protection, TWP 1500 is the superior product.

TWP 1500 was formulated using the latest technologies and raw materials to conform to the recommended VOC regulations and also to improve its efficacy as a wood preservative.

TWP 100 and TWP 1500 share the following similarities:

  • Both TWP 100 and TWP 1500 block absorption and shed water efficiently, and neither is prone to mold, algae, and mildew formation. 
  • They produce a beautiful natural-looking finish exposing the grain of the wood and retaining its natural appearance. 
  • Both TWP 100 and TWP 1500 maintain their initial hues quite well. Most wood stains and preservatives become visibly different in color as time goes by.
  • For best results with either, apply two coats each wet. The first for maximum absorption and saturation and the second coat for a smooth evened-out finish. You do not require the services of a handyman for these stains. They are easy enough to apply and smoothen out. If reapplication is needed, minimal sanding down can be done if any, and reapplication is just as straightforward as a first-time application.
  • Neither TWP 100 nor TWP 1500 is recommended for brand new wood. New wood holds stiff and is not readily malleable or absorbent. Both these stains need to get absorbed into the grain of the wood. Wood that is less than five months old will not absorb stains well and will create unseemly bumps which will ruin the overall finish. Additionally, if the stain does not get absorbed, the intended shade will not materialize leaving the wood unattractive.
  • Neither TWP 100 nor TWP 1500 is recommended for indoor use. Though TWP 1500 has significantly lower VOC levels, in an indoor space air pressure is greater, increasing the volume of harmful compounds you inhale in every breath. There are wood treatments designed for indoor spaces.

TWP 1500 outperforms TWP 100 in the following ways:

  • TWP 1500 offers better UV light protection than the 100 version. 
  • TWP 100 comes in 6 colors while the TWP 1500 has 8 colors to choose from.
  • Due to slight differences in the formula, 1500 gets absorbed and dries slower taking anywhere between 4-12 hours. TWP 100 seeps into wood faster and dries in 2-6 hours.
  • TWP 100 is 30-40pc solid while TWP 1500 is more viscous at 60-70pc solid content.
  • TWP 1500 holds up against wear and peeling much better than TWP 100 which will begin to show signs of disrepair at the two-year mark. TWP 1500 can hold on longer and in top-notch condition compared to TWP 100.
  • TWP 1500 VOC levels are significantly lower than those in TWP 100.

Bottom line: TWP 100 Vs TWP 1500?

In low VOC states, TWP 100 is unavailable so the only option is to use TWP 1500. 

If both are available where you are, either stain offers great wood preservation but it would be better considering all factors to go for TWP 1500.

TWP 1500 is safer to use, lasts longer, gives a better overall finish, offers better UV protection.