1981 Outrage V-20: Gel Coat Required For Hull Interior

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Author Topic:   1981 Outrage V-20: Gel Coat Required For Hull Interior

powdahbonz posted 03-20-2012 08:30 PM ET (US)
How much Spectrum Desert Tan gel coat resin would be needed to re-do the interior deck of a 1981 OUTRAGE V-20? Would a gallon cover it? It's quite pricey.
Jeff posted 03-20-2012 08:47 PM ET (US)
It will likely be very close if you use a gallon. I would order more than a gallon.
All of that said, a gallon of gel coat resin bought locally from a fiberglass shop with be half the price of Spectrum, or even less. No matter what, you will need to add tints to the spectrum product to get it match exactly. If you are adding tints anyways just start with white and add your tints if you need to match. If you are doing the entire interior and do not have to match to anything because you are covering it all, that is more of a reason not to use Spectrum and buy locally.
Also, many do not like to do gelcoat on the interior is the wet sanding and polishing you have to do with gelcoat is VERY time consuming and often challenging around all of the interior surfaces. AWLGRIP will work great on the interior and be glossy right out of the gate with no finish work. Save the gelcoat for the large flat surfaces of the exterior.
Buckda posted 03-20-2012 08:50 PM ET (US)
Good advice from Jeff, however, AWLGRIP is also quite spendy. AkzoNobel is proud of their products!
jimh posted 03-21-2012 08:39 AM ET (US)
It is often cited that gel coat resin should be applied to a thickness of 0.020-inch or 20-mils. If we have a gallon resin, that is a volume of 231-inch^3. Let us allow for some waste in the applicator and some over spray. Perhaps we can say that from a gallon we will get 200-inch^3 (or 0.11574-foot^3) of useful resin applied to a surface. If we apply at a uniform thickness of 0.020-inch, then the coverage area should be about
200-inch^3 / 0.020-inch = 10,000-inch^2
To convert to foot^2 we divide by 144. The coverage area of a gallon at a thickness of 0.020-inch is
10,000-inch^2 x 1-foot^2/144-inch^2 = 69-foot^2
We can roughly approximate the surface of the interior deck of the OUTRAGE V-20 by its length and width. From the REFERENCE section information I find the dimensions to be
Length = 19-foot 10-inch = 19.83-foot
Width = 7-foot 4-inch = 7.33-foot
The surface area of the deck may be approximated as Length x Width:
19.83-foot x 7.33-foot = 145.4-foot^2
Perhaps we can reduce the deck area estimate somewhat to account for the taper in the bow. Let us say the deck will be 120-foot^2. What thickness of resin application will we get from our gallon of resin? We calculated earlier that a gallon of resin will have a useful volume of 0.11574-foot^3, and the area to be covered is 120-foot^2, producing a thickness of
0.11574-foot^3 / 120-foot^2 = 0.000964-foot or 0.0115-inch
We can cover the deck area to a thickness of 0.0115 or about 11-mills.
powdahbonz posted 03-21-2012 01:14 PM ET (US)
Haven't decided on either option..but the least spendy would be better. We are talking about an 81 hull. I'm only re-doing the interior deck becuase I've pulled it all off and I am replacing the tank and foam, etc currently. Thought it would nice to finish off the work with a clean coat under the feet when done. I'm not in the mood to sand gelcoat after the work I'm already investing.
So I'm gathering that Awlgrip would suffice? Suggestions on another alternative to the floor coating, besides Dri-Dek which is 7.00 a square?
Thought about Durabak but then you can rest assured no one will want to take a spill on that floor.

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Author	Topic: 1981 Outrage V-20: Gel Coat Required For Hull Interior
powdahbonz	posted 03-20-2012 08:30 PM ET (US) How much Spectrum Desert Tan gel coat resin would be needed to re-do the interior deck of a 1981 OUTRAGE V-20? Would a gallon cover it? It's quite pricey.
Jeff	posted 03-20-2012 08:47 PM ET (US) It will likely be very close if you use a gallon. I would order more than a gallon. All of that said, a gallon of gel coat resin bought locally from a fiberglass shop with be half the price of Spectrum, or even less. No matter what, you will need to add tints to the spectrum product to get it match exactly. If you are adding tints anyways just start with white and add your tints if you need to match. If you are doing the entire interior and do not have to match to anything because you are covering it all, that is more of a reason not to use Spectrum and buy locally. Also, many do not like to do gelcoat on the interior is the wet sanding and polishing you have to do with gelcoat is VERY time consuming and often challenging around all of the interior surfaces. AWLGRIP will work great on the interior and be glossy right out of the gate with no finish work. Save the gelcoat for the large flat surfaces of the exterior.
Buckda	posted 03-20-2012 08:50 PM ET (US) Good advice from Jeff, however, AWLGRIP is also quite spendy. AkzoNobel is proud of their products!
jimh	posted 03-21-2012 08:39 AM ET (US) It is often cited that gel coat resin should be applied to a thickness of 0.020-inch or 20-mils. If we have a gallon resin, that is a volume of 231-inch^3. Let us allow for some waste in the applicator and some over spray. Perhaps we can say that from a gallon we will get 200-inch^3 (or 0.11574-foot^3) of useful resin applied to a surface. If we apply at a uniform thickness of 0.020-inch, then the coverage area should be about 200-inch^3 / 0.020-inch = 10,000-inch^2 To convert to foot^2 we divide by 144. The coverage area of a gallon at a thickness of 0.020-inch is 10,000-inch^2 x 1-foot^2/144-inch^2 = 69-foot^2 We can roughly approximate the surface of the interior deck of the OUTRAGE V-20 by its length and width. From the REFERENCE section information I find the dimensions to be Length = 19-foot 10-inch = 19.83-foot Width = 7-foot 4-inch = 7.33-foot The surface area of the deck may be approximated as Length x Width: 19.83-foot x 7.33-foot = 145.4-foot^2 Perhaps we can reduce the deck area estimate somewhat to account for the taper in the bow. Let us say the deck will be 120-foot^2. What thickness of resin application will we get from our gallon of resin? We calculated earlier that a gallon of resin will have a useful volume of 0.11574-foot^3, and the area to be covered is 120-foot^2, producing a thickness of 0.11574-foot^3 / 120-foot^2 = 0.000964-foot or 0.0115-inch We can cover the deck area to a thickness of 0.0115 or about 11-mills.
powdahbonz	posted 03-21-2012 01:14 PM ET (US) Haven't decided on either option..but the least spendy would be better. We are talking about an 81 hull. I'm only re-doing the interior deck becuase I've pulled it all off and I am replacing the tank and foam, etc currently. Thought it would nice to finish off the work with a clean coat under the feet when done. I'm not in the mood to sand gelcoat after the work I'm already investing. So I'm gathering that Awlgrip would suffice? Suggestions on another alternative to the floor coating, besides Dri-Dek which is 7.00 a square? Thought about Durabak but then you can rest assured no one will want to take a spill on that floor.