This question requires consideration of several pieces of information such as type of paint to be removed, number of layers, substrate, climatic conditions and so on… Yet when taken in generality we can provide you with information from our experience that will aid you in making an informed decision.
RemovALL 210 & 220 are rated as Industrial Paint strippers and were specifically designed for use on non-porous (i.e. metal surfaces). According to the manufacturer, this use should produce best results. That’s not to say the product cannot be used successfully on variable substrates. The product name is merely stating optimum use of the product. RemovALL 210 is the spray grade version of the product and many of you may have seen it in use on a popular home improvement TV show in the upper Northeast. RemovALL 220 is its brush grade equivalent.RemovALL 310 & 320 are rated as Architectural Paint strippers and were specifically designed for use on porous (i.e. wood surfaces). RemovALL 320 would naturally be assumed to be its brush grade counterpart as with RemovALL 220 above, but this may not be entirely true. Not too many years ago RemovALL 320 was sold under the label Janitorial Paint stripper and not Architectural Paint stripper therefore it developed a large following in building upkeep and maintenance. Maintenance department personnel at large corporations, hospitals etc… often use the product to remove the wax and coatings from their floors. The product has low odor and therefore is very suitable to large environment needs. To this end many folks purchase RemovALL 320 as the brush grade equal to RemovALL 310 but we suggest that you do not go this route. While our test results for RemovALL 320 show that the product is indeed effective at removing paint, it tends to dry out much quicker than RemovALL 220 and usually shrinks from its edges inward after application. This may require that a second application be applied later; at least along the outer edges (approximately a one foot area) to strip the entire surface properly. Because outside conditions tend to dry paint remover products with ease, we feel that RemovALL 320 warrants an interior (controlled environment use) rather than an exterior one. If you have previously used RemovALL 310 on the exterior surface with great success (as it is truly meant for that purpose) and are searching for a brush grade equivalent to it, we suggest RemovALL 220 as its closest match. Although primarily made for non-porous surfaces it will still do amazingly well on porous substrates, stay wetter longer in outdoor conditions, and shrink only slightly if at all. Sometimes still there are tougher coatings to remove; especially those applications of heavy industrial use like highway maintenance (bridges, tunnels etc…) and therefore RemovALL 510/520 step into the limelight. These products are specifically rated for Automotive & Heavy Industrial use. As with RemovALL 210, RemovALL 510 is the spray grade version of the product, while RemovALL 520 is its brush grade counterpart. That leaves only a specialty remover for Anti-Fouling and Fiberglass applications. That product would be RemovALL 610/620. RemovALL 610/620 was designed for the pleasure boating industry. Keeping in line with the products before, RemovALL 610 is the spray grade version of the product, while RemovALL 620 is its brush grade counterpart. To sum up the RemovALL paint stripping products are very straightforward with the exception of RemovALL 320. Here is how we recommend use of these products… RemovALL 220… absolutely the best product for all-purpose paint stripping! Also has the distinct advantage of being thin enough to still work properly in most commercial spray applicators. This makes it a 2 for 1 product. It is the single most recommended product by the manufacturers own technical support staff and the flagship product of the entire line. RemovALL 310… a great spray grade product for exterior architectural surfaces. RemovALL 320… building maintenance crews and janitorial service companies just love this product. It’s great for stripping wax buildup from floors and is often cut 50/50 with water (although not recommended) according to professional insiders. RemovALL 210… a great spray grade product for many exterior surfaces. RemovALL 510… a great spray grade product for heavy industrial use on bridges, train trestles, automobiles and other heavy industrial applications. Not recommended for aviation use in any circumstance! For aviation recommendations you need to call or email us. RemovALL 520… the brush grade equivalent to RemovALL 510. Not near as popular as 510 but utilized in situations where brushing is an absolute necessity. RemovALL 620… the perfect product for pleasure boaters who have fiberglass surfaces that need stripping. RemovALL 610… often used by people who are in the restoration business of carousel horses and other carnival equipment items or items of a fiberglass make that need the ease of a spray application. Other things we can tell you about RemovALL paint removers… RemovALL paint removers typically produce best results when used in an average temperature environment of 60 to 80 degrees. Excessive sunshine, wind, rain, cold or insufficient remover thickness are all factors that produce varying or even disappointing results. Here are some additional product use suggestions to keep in mind. 1. Always stir the product before use (high speed drill mixing is highly recommended). 2. Apply the product liberally (not thin like a coat of paint). Your not brushing it on, your globbing it on! 3. Do not apply the product in direct sunshine, high heat or cold temperatures. This may cause the product to dry out and/or stop working. You might consider covering the product with a mesh substance or optionally purchase (manufactured by Dumond Chemicals) to help lock in the stripping action of the product while protecting it from the drying agents of nature. 4. Although removal times vary, best results are normally seen after roughly 11 – 12 hours whereas the 23 – 24 hour timeframe can often be associated as the ideal time for removal. But again this does vary case by case. Dwell time depends largely on the situation and the type of paint you are trying to remove. As long as the product has not dried out it will continue to work. If the product does dry on the surface you need to work to remove the product right away or reapply more product over itself to reactivate. After 23 hours RemovALL 220 removed 15 paint layers with ease.
5. RemovALL 320 will often shrink the most from the outside edges in. It’s not uncommon to apply a second thinner coat over the original application after an initial 5 – 6 hours when using this product.6. We always suggest testing with a sample size or sample patch first if you are unfamiliar with the product. There may be instances where the product cannot perform properly such as poor paint adhesion or age. If the layers of paint to be removed are not properly set, the stripper will remove only up to that layer. Re-application is then needed after stripping the top layers. Paint that was applied to the substrate more than 100 years ago may also have varying results. We hope this document helps you make an informed choice for your project.