What is the difference between the 501 and 551 versions of this sealant?

Both are non-sag, but 501 is for horizontal surfaces and 551 is for vertical surfaces. Not sure what the difference is. The last letter indicates the color. (W=white)

can this caulk tube of dico r be reseal ed after opening, to be used at a later date or will it just dry out.?

There is a product out there called Little Red Cap (https://www.amazon.com/Little-Red-Cap-Canister/dp/B076CRG6WN/ref=sr_1_3?crid=26RMJPU78XU9Y&keywords=little+red+cap+caulking+tube+covers&qid=1568080303&s=automotive&sprefix=little+red+cap+c%2Cautomotive%2C178&sr=1-3-catcorr). I have had tubes covered for many months and they don't dry out. I have found this at local hardware stores as well.

ASIN	B003YJLIW8
Best Sellers Rank	#10,467 in Automotive ( See Top 100 in Automotive ) #1 in RV Cleaning, Storage & Maintenance
Brand	Dicor
Brand Name	Dicor
Color	White
Compatible Material	Rubber, Epdm, Dicor Diflex Ii, Tufflex, Pvc, Pritek Tpo
Customer Reviews	4.6 out of 5 stars 4,337 Reviews
Global Trade Identification Number	00677917000661
Included Components	Dicor Corporation 551Lsw-12 Edpm Lap Seal 10.3 Oz. Tube Wht
Item Dimensions	28.6 x 5.1 x 5.1 centimeters
Item Form	Liquid
Item Type Name	Dicor Corporation 551Lsw-12 Edpm Lap Seal 10.3 Oz. Tube Wht
Item Weight	0.9 Pounds
Item dimensions L x W x H	28.6 x 5.1 x 5.1 centimeters
Item weight	0.9 Pounds
Manufacturer	Dicor
Material	Rubber
Material Type	Rubber
Style	Non-Leveling
Style Name	Non-Leveling
Surface Recommendation	Roof
UPC	677917000661
Unit Count	10.3 Milliliters
Water Resistance Level	Waterproof
Water resistance level	Waterproof

Dicor 551LSW-1 HAPS-Free NON-Leveling Lap Sealant - 10.3 Oz, White, Secure, Ideal for RV Roofing, Maintenance, Repair, Appliance Application

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