Lippert Alpha Systems 1021 Lap Sealant vs Dicor 501LSG Self Leveling Lap Sealant

Both are self-leveling lap sealants for horizontal RV roof work, and both are well established. The Dicor 501LSG-1 is the safer pick for EPDM and TPO membrane roofs because it is UV stabilized and made not to stain or discolor the sheeting. The Lippert Alpha 1021 is the better choice for metal and fiberglass roofs and for anyone who wants a low-VOC, paintable formula; it also has a much larger rating base, 4.8 from 110 ratings against 4.7 from 17.

• Choose the Lippert Alpha 1021 if you are sealing a metal or fiberglass roof, want a low-VOC paintable sealant, or want the product with the deeper track record of owner ratings.
• Choose the Dicor 501LSG-1 if your roof is EPDM or TPO and you want a UV-stabilized sealant that is formulated not to stain or discolor the membrane.